Chemistry 104 Study Groups

ACIDS & BASES PROBLEM
ANSWER
 

Exercise

  Consider an acid HA with Ka = 5.2 x 10—5 and molar mass = 125 g/mol. To make a solution with pH = 3.05, what mass of HA would be dissolved in 250 mL of aqueous solution?

 

Answer

 

[HA] = 0.016M for the pH of the solution to be 3.05

0.5 g of HA would need to be dissolved in 250 mL of aqueous solution.

 

Explanation

 
  1. This problem requires the use of ICE.
  2. Since the pH is given, [H3O+] can be determined and is equal to [A-].


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