Question

Post-Lab Questions 1. A student was in a hurry and decided to take a shortcut in the Procedure. After washing and drying the crucible with towels, the student did not do steps 2, 3, and 4 in the Procedure, but immediately went to step 5 and continued from there. What is the error that will be introduc into the experiment? 2. If your sample contained a volatile impurity, what value would be in error, the mass of the anhydrous salt or the mass of the water? Explain your answer. 3. Below are the formulas of some hydrates. What is the mole ratio of salt to water? Salt Water Hydrate Na SO4-10H2O Co(NO3)2" 6H20 Mo(NO3)2-5H20 CaSO4-2H2O (CaSO H20 4. A student worked with a sample of ZnSO47H-O. a. How many atoms of each kind are present? b. What is the stoichiometric ratio of salt to water? c Calculate the percent of water in the hydrate. Show your work

Answer 1

Zin Z 丄 14 כש ZnSOy. TH 20 → each molecule Sal+ ( Zn Soy) מו attached/6cm ded with 7 molecule 2 2 C Molan ma mole (M.M c mole 1,0 )

26초 xico 286.5 = 1398% Ams