: lmwAL-mne'nmj mouse Mac-meswn SULFATE not) 2. (Show work.) (0.3610 g /1.000 g)(100) = 36.10%. The mass of a fost tube and hydrate was 35.2755 grams. Prior Knowledge: 2.8: Atoms and the Mole; 2.9: Calculations Determing the Mass, Moles and Number of Particles 5 H2O. If some table salt, NaCl, gets wet, it is now a hydrate! structure. grams of hydrate in the sample Mass Percent of a hydrate in a mixture = 100 total mass of the sample What was the mass of water lost? Mass of evaporating dISh empty I Mass of evaporating dish + hydrate & BaCl2 after second heating _______________g, 7. What is a hydrate? Explain why the experimentally determined empirical formula may not match the actual formula of Epsom salt (propose at least 2 ideas). the molar mass of the hydrate and multiplying by 100. equal the mass of the hydrated salt. ' M mgwMasa U' HYDEAV Percent Water in a Hydrate Created by. a. barium chloride dihydrate b. zinc sulfate heptahydrate 5. Experimentally measuring Lab 09 - Percent of Water in a Hydrate Pre-Lab Questions Name: Date: Instructor: Section: Read the following laboratory experiment and answer the questions below. percent hydrate lab percent composition of hydrate lab introduction: ionic compounds often separate from water solution with molecules of water incorporated. The number of water molecules in a typical hydrate is characteristic of . 3. Hydrates are ionic compounds that contain water molecules as part of their crystal structure. Find the mass of the water lost after heating. Mass of BaCl2 (Show work.) a. barium chloride dihydrate b. zinc sulfate heptahydrate 5. Comparison of your experimental results to the reference information you produced in your Pre-lab should allow you to identify the unknown. Subtract the two to determine the mass of your unknown. Determine the mass percentage of water in a hydrate 5. From its formula, what is the percentage of water in your hydrate? 1. 7 x 18 / 278 x 100 = 45%. w. Mass of crucible We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Attach a second Carefully touch the outside of the test tube. your initial sample: 22-06 .J '4 A sample contains radioactive atoms of two types, A and B. (Show work.) To the percent water a hydrate, the mass of a,hydrate is obtained. a. A hydrate that has lost its water molecules is said to be 3. The gravimetric analysis of this experiment is meant to be quantitative; therefore, all precautions should be made to minimize errors in the analysis. Don't require work unless, Dry Lab 2A Inorganic Nomenclature I. Oxidation Numbers, Experiment 7, Empirical Formula, Calculations, Homework Assignment - Microscopy and Cell Structure Lab, Experiment 9 and 10 - Lab report for Professor Driver, Care of the childrearing family (nurs420), Introduction to Environmental Sciences (ENVS 1301), Advanced Concepts in Applied Behavior Analysis (PSY7709), Philippine Politics and Governance (PPG-11/12), Introduction to Interpersonal Communications ( COMM 102), Electrical Machines and Power Electronic Drives (E E 452), Professional Application in Service Learning I (LDR-461), Advanced Anatomy & Physiology for Health Professions (NUR 4904), Principles Of Environmental Science (ENV 100), Operating Systems 2 (proctored course) (CS 3307), Comparative Programming Languages (CS 4402), Business Core Capstone: An Integrated Application (D083), Chapter 1 - Principles of Animal Behavior, Ch1 - Focus on Nursing Pharmacology 6e Experimental value theoretical value Theoretical value x 100 6. Mass of empty A hydrate that has lost its water molecules is said to be 3. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. %PDF-1.3 Why the difference? Record in notebook. Lab Report F arm Note: You are to show all Work in youn calculations, . Full Document. Divide the Lab 09 - Percent of Water in a Hydrate Pre-Lab Questions Date: Name: - Section: Instructor: - Read the following laboratory experiment and answer the questions below. Answer1) Ahydrateis a solid ionic compound that contains specific number of water molecules in its crystal structure. The water molecules interact with some of the \(d\) electrons in the copper ion and produce the color. 8. Using the data collected, determine the mass of the anhydrous salt at the end of the minutes to knock out any of the water of hydration. Answer the following and show all work for credit a. Initially there are five times as many A atoms as there are B atoms. Predict the percent of water in a hydrate mathematically. stream % Dispose of sample in the correctly marked container. 20.1-23- - . G. The lonic compound was found to be calcium nitrate. has been driven off, the two masses should A 4.68 g of a hydrate is heated to remove its water content, and the residue solid weighs 3.54 g. Determine the percent water in the hydrate. From your experimental data, what is the percentage of water in your hydrate? How many moles of water were lost? 12. The (s) b. a at 4. Name: Dae| Instructor: Time & Day of lecture: -7. Measuring the mass. This is your experimental value. : an American History (Eric Foner), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. Then heat the test tube more strongly until no more droplets of water can be seen forming on the inside of the test tube. Record this mass to +0.01 g. In this lab you will determine the percentage of water contained in various hydrates. While this is heating, record any observation about the hydrate on the data sheet. This lab explores how to remove water from an ionic compound when it . 8. It is generally possible to remove the water of hydration by heating the hydrate. Mass of water (Show work for credit.) (Convert mass to moles.) water. Using the correct formula, find the percent water in copper (II) sulfate pentahydrate. nu ,y. .1 .541. g/mol 6. = 249.72 g/mol This is your theorectical value. Lab 2: Determine the Percentage of Water in a Hydrate: The goal of this experiment is to learn how to properly calculate the ratio of salt to water, in a hydrated salt, and to calculate the percentage of water (by mass) within a hydrated salt. to learn to handle laboratory apparatus without. Add them together to get the mass of the hydrate. The difference between the hydrate mass and anhydrate mass is the mass of water lost. 2. 5. the dimmer the object. Using a spatula, transfer approximately 2 grams of your unknown hydrate sample into the test tube. Explain your answer 3. Cross), Brunner and Suddarth's Textbook of Medical-Surgical Nursing (Janice L. Hinkle; Kerry H. Cheever), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Psychology (David G. Myers; C. Nathan DeWall), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), PRELAB 5 PERCENT WATER IN A HYDRATED SALT QUESTIONS 3,5,6, Dry Lab 2A - These are for Lab Professor Graeme or Constantino. the anhydrate are calculated and the # moles of the water are calculated. Using the correct formula, find the percent water in copper (II) sulfate pentahydrate. This is a physical separation. Calculate . Then heat the sample Using the correct formula, find the percent water in copper (II) sulfate pentahydrate. the mass of water in the hydrate can be determined. of the primary material. This page titled 10.11: Percent of Water in a Hydrate is shared under a CK-12 license and was authored, remixed, and/or curated by CK-12 Foundation via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. (1.803 - 1.426)/1.803 = 2.09. Note that the dot in the a. Percent hydration Percent Water in a Hydrate Lab 5 Pre-Lab. Accurately b. Name: Dae| Instructor: Time & Day of lecture: -7. compounds that incorporate water molecules into their fundamental solid and multiply this fraction by 100. it. The molar mass of the hydrate is the molar mass of the \(\ce{CoCl_2}\) plus the mass of water. Digication ePortfolio :: General Chemistry (Alexander Antonopoulos) by Alexander P. Antonopoulos at Salve Regina University. an unknown hydrate will be heated to determine the percentage of water originally present in it. mass of water in one mole of the hydrate by the molar mass of the hydrate Safety Always practice safe laboratory procedures. What are some of the technologies used to measure temperature? You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Group of answer choices Crystals Bulbs Ammeter Bimetallic strips Diodes Infrared light Convective eddies, Burning of fuel in a car's motor reaches temperatures of 1,091 K. If the atmosphere is at 300 K, what is the maximum efficiency of this heat engine (to two decimal places) ? What is the percentage water in this student's unknown? Discuss. (Show work) 4. Using the actual formula of the hydrate given to you by Mr. E, and the atomic masses on the periodic table calculate the theoretical percentage of water present in the hydrate. a. value _______________% H2O, Atomic masses: H = Match. Match. Record the masses in your laboratory notebook. formula (or multiplication sign) indicates that the waters are there. Ionic compounds are those that are binary compounds containing a metal and a 2. The mass of the water divided by the initial mass of the hydrate will give you the mass percent of water in the hydrate. This is the pre-lab video for the . Calculate the percentage of water in this hydrate. What do the following symbols represent? Obtain an unknown sample of a hydrate. experiment: 20.423 " 3.02 9 found by comparing the mass of water released (when heated) to the original mass of the compound, expressed as a percentage. lost. Name the following compounds: a. SrCl2-6 H20 b. MgSO4-7 H20 4. (Show work for credit.) r Adaptgdom a lab by Sally Mitchell Namei 13 LEV. (Convert mass to moles.) 5. 7. Allow the crucible to cool, then weigh Percentage of Water in a Hydrate Pre-Lab Quiz, Experiment 5: Percent Water in a Hydrated Salt, Applications and Investigations In Earth Science, Dennis G. Tasa, Edward J. Tarbuck, Frederick K. Lutgens, BIBC 100: Water and Weak Interactions (Lectur. Think coefficients!). (Show work for credit.) The name of the compound is cobalt (II) chloride hexahydrate and its formula is CoCl 2 6H 2O. To name hydrates, just name the ionic compound and then use the same prefixes as used to name molecular/non-acids, to indicate the number of water molecules in the hydrate. Find the mass of the original hydrate. Give the chemical formulas for the following. Learn. Mass of evaporating dish + anhydrous salt In a hydrate (which usually has a specific crystalline form), 2. Record this in your notebook. If someone were to tell you that copper sulfate is white, you likely would not believe them. Was this dissolving process exothermic or endothermic? Percent Water in a Hydrate Lab 5 Pre-Lab. we 7. 153.65; - 5144i , . ' 11. When it has lost its water molecules, it is said to be anhydrous. Calculate Explain your answer 3. He and Akerele are building out a new concrete materials lab. Each type of hydrate traps water in its own unique way, but heating a hydrate will release the After heating, the anhydrous sample had a mass of 1.8820 grams. Flashcards. The residue Procedure 1. What is a hydrate? Test. What are the safety precautions in this experiment? Mass of hydrated salt (g), 21 g 19 g = Trial 1 2 g 25 g 20 g = Trial 2 4 g 22 g 18 g = Trial 3 3 g, 21 g 19 g = Trial 1 2 g 24 g 20 g = Trial 2 4 g 21 g 18 g = Trial 3 3 g, 2 g 2 g = Trial 1 0 g 4 g 4 g = Trial 2 0 g 3 g 3 g = Trial 3 0 g, Percent by mass of volatile water in hydrated salt (%), 0 g / 2 g x 100 = Trial 1 Trial 2 Trial 3 & BaCl2 after first heating _______________g, 5. Calculate percent error. Mass of BaCl2 Your blue-green copper sulfate has several water molecules attached to it, while your friend's copper sulfate is anhydrous (no water attached). A hydrate is a compound that has one or more water molecules bound to each formula unit. the faster the object. the barium chloride in the container provided. Calculate the loss in mass upon heating for each sample and attribute the mass loss to the water of hydration. Step 1: List the known quantities and plan the problem. (Show work.) Record this mass on your Data Table 9. Record this mass on Data Table. 3. Note: Always use crucible tongs or a test tube holder when transporting a test tube. To the cooled anhydrous hydrate, add about 5 ml d.l. A HYDRATE. A power plant uses a 900 Kelvin boiler and a river at 300 Kelvin for cooling. What is the percent water in lithium nitrate trihydrate? It is useful to know the percent of water contained within a hydrate. Mass of the anhydrous (without water) Copper(II) sulfate. 4. The process of calculating the percent water in a hydrate is described. .. Vii"! Record the mass in the data table. 4. 4 0 obj Percent of water in the hydrate sample. (Hint: Have you seen this compound before? Place the evaporating dish back up on the metal gauze and heat strongly for about 5 So for every formula unit, there would be some amount of water molecule combined with the ionic compound and would act as a single compound. Trial 1Trial 2 8.45%9% 8 9 = -1 (-1)9 9 = -0 (-0) 22 = 1= 0. Multiplying PROCEDURE weigh a clean, dry crucible. 0.6390 g, 1. attached to each formula unit of the compound. (Nearest Whole Numbers) Moles water : Moles anhydrous calcium nitrate e. What is the formula for this compound? Place the 7' Ma :5 A a O Masai-Han 3. What is your percent error? 2. agree. Follow the specific instructions in the lab manual for preparing for the weighing bottles. Determine the percent water of hydration for each sample, and compute the average. Why must you use tongs or a holder to handle the test tube after heating? safety glasses, matches/lighter. Create three research questions that would be appropriate for a historical analysis essay, keeping in mind the characteristics of a critical r, Tina jones comprehensive questions to ask, Leadership class , week 3 executive summary, I am doing my essay on the Ted Talk titaled How One Photo Captured a Humanitie Crisis https, School-Plan - School Plan of San Juan Integrated School, SEC-502-RS-Dispositions Self-Assessment Survey T3 (1), Techniques DE Separation ET Analyse EN Biochimi 1, Molecular weight of water is 18. Draw a diagram of the experimental set-up and label all of the "equipment gunmen , DATA TABLE: . 10. This lab explores how to remove water from an ionic compound when it is stuck in the compound's crystal lattice. What is the percent water in calcium nitrate tetrahydrate? A hydrate that has lost its water molecules is said to be 3. combined with the salt in a denite ratio. 1. . 1. 3. Dividing this number by the original mass will give the percent water in the hydrate. The mass of water in the hydrate is the coefficient (6) multiplied by the molar mass of \(\ce{H_2O}\). However, it turns out that you are both right; it just depends on the copper sulfate. crucible _______________g, 2. The mass of the anhydrous salt and test tube was 31.0035 grams. PRELAB 5 PERCENT WATER IN A HYDRATED SALT QUESTIONS 3,5,6 d01 e5 (h2o) 1.803 1.426 0.377 0.377 1.803 mass of hydrated salt trial trial 21.626 19.437 2.189 20. The mass of the empty test tube was 23.7726 grams. Experiment 605: Hydrates . 1. Now nd the mass of the evaporating dish + hydrate and record in the data table. What is the formula for this compound? Properties of Hydrates. 2. b. number of waters. percent water calculation from your experiment, determine the percent error. Instructor: Section: Unknown Hydrate Number Mass of test tube and hydrate, grams Mass of empty test tube, grams Mass of unknown hydrate, grams Mass of test tube and anhydrous hydrate (after heating), Mass of empty test tube, grams Mass of anhydrous hydrate, grams Mass of water lost, grams Did the solution feel hot or cold? c. What was the percent water in the hydrate? Pre-Lab E When a hydrate contains water molecules it is said to be hydrated. Flashcards. c. The ionic compound was found to be calcium nitrate. Pre-Lab Assignment for Analysis of Hydrates 1. I In 4 r 1 8. What is the formula of the hydrate that you used in this experiment? Our theoretical hydrate for this lab was CuSO4 * 5H2O. 3.04 e r experimental percentage of water. 3H2O; magnesium carbonate pentahydrate - MgCO3 6. Hydrates are Answer1) A hydrate is a solid ionic compound that contains specific number of water molecules in its crystal structure. sheet and clearly show all calculations. Accessibility StatementFor more information contact us atinfo@libretexts.org. How many moles of water were lost? Find the mass of the water lost after heating. Choose all that are correct. c. What was the percent water in the hydrate? The mass of a test tube and hydrate was 35.2755 grams. After preparing the weighing bottles, weigh each weighing bottle on the analytical balance to the nearest 0.0001 g. Record the masses, time and date in the prepared format in your notebook. The ___ ___ of water in a hydrate is found by comparing the mass of water released (when heated) to the original mass of the compound, expressed as a percentage. anhydrate. of hydrate used is equal to the fraction of water in the compound. .r ., e z,. 1 (.t Calculate the percent by mass of water in the hydrated calcium sulfate. Using the data collected, determine the mass of the hydrate that you started with: (Show work.) examples of hydrates are: lithium perchlorate trihydrate - LiClO4 2 H2O _______________g (#2 - #1), 4. should be almost pure white. Place the weighing bottles in a 50mL beakers in a 800 mL beaker, cover with a watch glass, and heat for specified time at some temperature to drive off the water of hydration. A hydrate can usually be converted to the anhydrous compound by heating. r; it I nonmetal, or compounds that contain a polyatomic ion. Define these terms: a. Hydrate b. Anhydrous solid c. Deliquescent 2. What is the name of the hydrate that you used in this experiment? Answer 2) A hydrate that . b. Obtain a large Pyrex or Kimax test tube and weigh it to the correct number of significant digits on an analytical balance. Discard the solution in the appropriately marked container. Show calculation. Find the mass of the original hydrate. Allow cooling for several minutes. 7. + 5 H2O (g) In another experiment, the mass of a hydrate was found to be 2.7090 grams. . Molecular weight of iron (II) sulfate heptahydrate is 278. crucible on a ring stand using a ring and clay triangle and heat gently 1. Weigh the weighing bottles containing the green crystals to the nearest 0.0001 g using the same analytical balance that you used in determining the mass of the empty weighing bottles. Dividing the mass of the water lost by the original mass This resource is a classic chemistry laboratory to find the percent of water in the copper (II) sulfate hydrate. A hydrate that has lost its water molecules is said to be 3. the chemical name is calcium sulfate dihydrate. Instructor Test Bank, BIO 115 Final Review - Organizers for Bio 115, everything you need to know, C225 Task 2- Literature Review - Education Research - Decoding Words And Multi-Syllables, ECO 201 - Chapter 5 Elasticity and Its Applications, Tina Jones Health History Care Plan Shadow Health.pdf, Summary Give Me Liberty! When all hydrating water is removed, the material is said to be anhydrous View hydrate is heatedzuntil no more water vapor is given off and the mass remains constant. In this laboratory experiment, you will determine the molecular formula of a known hydrate and the percent composition of a hydrate in a mixture of a hydrate and an inert salt. 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The accepted value for the percent water in the hydrate tested in #5 is 24.6% If the percent error of an experiment is: % error = Experimental. Calculate the value of " n ", the number of moles of water molecules present per mole of CuSO 4 and Epson Salts. (Show work for credit.) Find the percent water in cobalt (II) chloride hexahydrate, \(\ce{CoCl_2} \cdot 6 \ce{H_2O}\).