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A solution contains 0.750 M HA (Ka = 1.0 x 10-6) and 0.250 M NaA. What is the pH after 0.100 mole of HCl is added to 1.00 L of this solution?
a) 3.17
b) 6.00
c) 5.25
d) 1
e) 5.75
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