(There are clean test tubes in drawers at the front of the lab if you need one) • Weigh approximately two grams ( 1.8 to 2.2g) of a hydrate sample (labeled I, II or III), record the mass on your data sheet. Equipment/Materials: Crucible (without lid), clay triangle or wire triangle, iron ring, ring stand, lab burner (Bunsen or Fisher), crucible tongs, electronic balance, heat pad, approx. 7 H2O. August 14th, 2013 09:48:23 AM . 4) Write the formulas for the following compounds: a) barium chloride dihydrate BaCl2 . Test. Spell. hydrates. Percent water in a hydrate • Weigh a clean and dry 20 x 150mm test tube on an analytical balance to ± 0.0001g. Ionic compounds that contain a transition metal are often highly colored. Each type of hydrate traps water in its own unique way, but heating a hydrate will release the water and leave the dehydrated material behind. The crystals change form, and sometimes color, as the water is driven off. Virtual Lab Hydrate.docx. Question: Percent Of Water In A Hydrated Salt PRE-LAB QUESTIONS Name: IDE A. percent of water lost by the hydrate can be calculated. Next summarize the conclusion(s) drawn in your discussion. 2. Test. Spell. Finding the percent of water in the hydrate will be done in a similar fashion. Gravity. When this occurs, the trapped water molecules are called water of hydration and they become an integral part of the crystal structure. What is the percent of water in Na2SO4 • 10H2O? the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. This “water of hydration” is released as vapor when the hydrate is heated. Background: Hydrates are ionic compounds (salts) that have a definite amount of water (water of hydration) as part of their structure. PLAY. Using A Periodic Table Calculate The Molar Mass Of Fe504-7H20 Date 1. First off the water was meant to see if the melting point was equal or below 100℃. Answers MUST be typed and stapled to your report.) Lab Exercise: Percent Water in a Hydrate Introduction: A hydrate is a crystalline solid that traps water as part of its crystal structure. - convert the mass of anhydrate to moles: - convert the mass of water to moles. Crucibles are VERY FRAGILE. Created by. Percent Water in a Hydrate CHE 117 Post-lab 1b Report Form Name: ANSWER Dispose of sample in the correctly marked container. On a separate sheet of paper, calculate the % composition of water in each of the following compounds: a) Magnesium sulfate heptadyhrate (MgSO 4 7H 2O) b) Sodium carbonate monohydrate (Na 2CO 3 1H 2O) c) Zinc sulfate dehydrate (ZnSO 4 2H 2O) d) Manganese sulfate monohydrate (MnSO 4 1H 2O) e) Calcium … Lab: Composition of a Hydrate Objective: To determine the percent water in copper sulfate pentahydrate and to verify its formula. the water in the pan is at a constant temperature of 15.5 °c. A hydrate is a compound that has one or more water molecules bound to each formula unit. pre lab "percentage of water in a hydrate" STUDY. From the difference in the mass of the hydrated and the anhydrous magnesium sulfate, one can find the mass of water liberated. Remember not to bring in any new information that you have not already mentioned. This suggests that water was present as part of the crystal structure. It Chloride Test Paper, Dlay Triangle, Crucible And Cover, 25 X 200 Mm Ignition Test Tube, Watch Glass. The reported percent of water in the hydrated salt will be too low because the second anhydrous salt will add mass, which means the overall total mass is higher. The chemical equation of… The aim of experiments was to determine the percentage of water in hydrated Ca(NO3)2. Obtain and wear goggles. B. Introduction: Hydrates are ionic compounds (salts) that have a definite amount of water as part of their structure. Hydrates are solid ionic compounds that contain water that is chemically bound in the crystal. Safety Always practice safe laboratory procedures. 6 H2O iron (III) chloride hexahydrate. Water of crystallization. How many moles of water … 6. Testable Prediction: Our unknown hydrate may be a hydrate of copper(II) sulfate, magnesium sulfate, iron(III) chloride, or iron(III) nitrate. DO NOT put hot crucibles on a balance! End your nomenclature unit with a lab! Flashcards. Chemistry: Lab – % Composition of a Hydrate Introduction: Salt Compounds that contain water molecules attached are called hydrates, or hydrated salts. b) magnesium sulfate heptahydrate MgSO4 . Created by. Post lab: 2- After the oils from the finger are burnt of in part B.1, the percent water in the hydrated salt will be unaffected because the oils have been driven off and the mass of the oils on the crucible would not be accounted for. Drawing conclusions Using your answers from items 3 and 4, determine the empirical formula for the copper sulfate hydrate. Experimental Question: How can we experimentally determine the formula of an unknown hydrate, A? Grace_Hermes1. 9.3 Dehydration of Hydrates – Procedure Safety Notes: Some of the unknown hydrates can discolor skin, so avoid contact. 2. katesett. The process of removing water from a hydrate, usually through applied heat. We obtained the percentages through experimental procedures of reacting Ca(NO3)2 with Na2CO3 , filtrating and drying CaCO3. The u0394 sign means that heat is applied. Home Data and Calculations Conclusions Conclusions: This laboratory investigation explored the relationship between percent composition and molar ratios and how to use one to find the other. Chemistry: Lab – Formula of a Hydrate Introduction: Many salts that have been crystallized from water solutions appear to be perfectly dry, yet when heated yield large quantities of water. Experiment 7 Analysis of Hydrates 7-4 Post- Lab Questions 1. Answers xXwolfieplayzXx a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. ZamJ713 1,558 views. LAB % COMPOSITION OF A HYDRATE.docx. They are crystalline compounds that have a specific number of water molecules trapped within the crystal lattice. What Is The Percent By Mass Of Water In Iron(it) Sulfate Heptahydrate, FeSO4.7H2O ? STUDY. the number of associated water molecules. Complete the folowing and submit your answers as a word document in Canvas. Terms in this set (16) A ___ ___is one in which a fixed number of water molecules is crystallized with each formula unit. 5 H2O copper (II) sulfate pentahydrate. one in which a fixed number of water molecules is crystallized with each formula unit. Applying conclusions Calculate the percent water in a mole of copper(II)sulfate pentahydrate using the formula. Also by holding the solid over the water not all of the solid is being exposed to the heat evenly. The polarity of the water molecule, which makes it a great solvent for ionic compounds, causes water molecules to cling to the structure of solid substances. Learn. Terms in this set (16) hydrate salt . 7. Comparison of your experimental results to the reference information you produced in your Pre-lab should allow you to identify the unknown. The solid remains unchanged except for the loss of the water. Safety: Crucibles are VERY HOT; always handle them with tongs. 5.00 grams of a sample of hydrated PtCl4 are heated and lose 1.5 grams of water. Be careful when handling hot glassware and equipment. Purpose. 9. Quarter 3 Chemistry Lab - Percent Water in a Hydrate - Duration: 13:26.