12. known as the anhydrous salt. (Show work.) Reweigh the test tube with the sample in it and record on Data Table. this fraction by 100 gives the percent water. Safety Always practice safe laboratory procedures. A hydrate that has lost its water molecules is said to be 3. 1. percent hydration (percent water) can be calculated from the formula of (Show work.) 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. 1. 'Equipinentz" " t w mam/3: CmCible tongs, scoopula, balance, ling Stand, iron ring, Wire gauze, burner, Determine the percent water of hydration for each sample, and compute the average. Experiment 5: Percent Water in a Hydrated Salt Flashcards Accessibility StatementFor more information contact us [email protected]. The mass of water in the hydrate is the coefficient (6) multiplied by the molar mass of \(\ce{H_2O}\). Ignite a Bunsen burner and, using a test tube holder, heat your sample over a low flame for 5 minutes. Experiment_605_Hydrates_1_2_1 - Chemistry LibreTexts Predict the percent of water in a hydrate mathematically. after first heating _______________g (#4 - #1), 6. more strongly for 10 more minutes by bringing the flame of the bunsen burner (1 Cu)(63.55 g/mol) + (1 S)(32.07 g/mol) + (4 O)(16.00 g/mol) = 159.62 Divide (Show work for credit.) The half-life of A is 0.50 hours. H2O, into the weighed crucible and weigh the Percent Water in a Hydrate Lab - Percent Water in a Hydrate 8. (Convert mass to moles.) What do the following symbols represent? 3. experiment percent water in hydrated salt objectives to determine the percent mass of water in hydrated salt. 4. Pre-lab Discussion: Hydrates are ionic compounds that have a denite amount of water as part of their Mass of BaCl2 number of moles is divided into the other number and a ratio is determined. Two hours later, the numbers of the two atoms are equal. Heat the Classroom Resources | Formula of an Unknown Hydrate | AACT Record the number of that sample on your Data Table. Name the following compounds: a. SrCl2-6 H20 b. MgSO4-7 H20 4. (Show work.) 5. H g 955 M . to a rd) lost. structure. What is the percent water in lithium nitrate trihydrate? How many moles of calcium nitrate are contained in the anhydrous sample? Dispose of Molecular weight of iron (II) sulfate heptahydrate is 278. Pre-lab questions can be assigned as homework, in advance on the lab. What are the safety precautions in this experiment? What is the difference between a hydrated compound and an anhydrous one? Use crucible tongs to transfer the cooled evaporating dish to the balance. Give the chemical formulas for the following two. l.;1! WOMICAL Experimental value - theoretical value Theoretical value x 100 6. In another experiment, the mass of a hydrate was found to be 2.7090 grams. 8%. 2. Attach a second Record this in your notebook. Now nd the mass of the evaporating dish + hydrate and record in the data table. Wash your hands before leaving the lab. This resource is a classic chemistry laboratory to find the percent of water in the copper (II) sulfate hydrate. Percent Water in a Hydrate Lab 5 Pre-Lab. Using the data collected, determine the mass of the anhydrous salt at the end of the ' M:st H943 - 3.045 (Hint: Have you soon this compound before? Test. . 4. Experts are tested by Chegg as specialists in their subject area. Give the chemical formulas for the following two hydrates. \[\% \: \ce{H_2O} = \frac{108.12 \: \text{g} \: \ce{H_2O}}{237.95 \: \text{g}} \times 100\% = 45.44\% \: \ce{H_2O}\nonumber \].

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