CHEMISTRY 1112

Review Quiz 2

Summer Session II 2002
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  1. A 50mL volume of 0.107 M HCl is added to an antacid sample.  The solution is

      titrated to the bromophenol blue endpoint using 23.7 mL of 0.0971 M NaOH.   

      How many moles of the base are in the antacid sample?

[Answer: 3.05 x 10-3 mol base]

 

 

 

 

 

  1. How many grams of HCl (stomach acid is 0.1 M HCl) would be neutralized by a

      tablet of Tums, a tablet that contains 500 mg of CaCO3?           [Answer 0.365 g HCl]

 

 

 

 

 

  1. A 27.5 mL volume of a 0.107 M NaOH solution is required to reach the

      stoichiometric point in titration 25.0 mL of an HCl solution with an unknown

      concentration.  What is the molar concentration of the HCl solution?              

      [Answer: 0.118 M HCl]

 

 

 

 

  1. If the stoichiometric point is viewed as occurring at a larger volume of NaOH titrant than the actual stoichiomtric point, is the molar concentration of the weak acid analyte reported too high or too low? Explain.

 

 

 

    

  

  1. True or False

a._____ Reaction rate increases as the temperature increases?

b._____ The higher concentration of light-absorbing species, the more intense is

              the color of the solution?

c._____ Mg was the least reactive metal?