Lab Problems

1) A 157.82 g sample of MgNO₃ ^. ???H₂O in an evaporating dish is heated until it is dry.  The mass of the evaporating dish is 152 g.  The mass of the anhydrous sample and the evaporating dish is 154.58 g MgNO₃.  What is the formula for the hydrate and name the hydrate?

ideal gas lab

2) A 0.36 g sample of  Mg is reacted with an excess of hydrochloric acid at  24C and 
    100.1 KPa.  The resulting hydrogen gas is collected under water.  The objective is to 
     generate the ideal gas constant experimentally.  The volume of the gas collected was 
    368 mL.  What was the ideal gas constant found in lab?  What was the percent error?

titration lab for acids/bases

3) How many mL of 1.00 M NaOH are needed to neutralize a 10.00 mL aliquot of
    1 M HCl after it has been partially neutralized to a .20 M HCl solution by the
     addition of 0.25 g CaCO₃ antacid?

molecule shape lab (lots of pipecleaners!)
Review shapes of compounds by first determining the Lewis dot diagram and then the number of shared and unshared pairs. 

Answers Lab Prob