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Which solution would show the least change in pH upon addition of 3.0 mL of 1.0...

Which solution would show the least change in pH upon addition of 3.0 mL of 1.0 M KOH? Assume equal volumes of each solution are used. Ka for CHO2H = 1.80 ✕ 10−4)

a. A solution that is 0.50 M formic acid and 0.50 M sodium formate.

b. A solution that is 0.10 M formic acid and 0.10 M sodium formate.   

c. A solution that is 0.1 M formic acid

d. A solution that is 0.50 M sodium formate

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