Calculate the pH of a 0.02 M solution of ascorbic acid ( K a1 = 7.9 × 10 –5; K a2 is 1.6 × 10 –12).?

a. 2.9

b. 8.2

c. 11.8

d. 11.1

e. 5.8

1 Answer

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  • Bobby
    Lv 7
    1 month ago

    because the Ka1  >> Ka2 we base our calculation on the hydrogen ions from that source 

    for a weak acid [H+] = SQRT(Concn * Ka) = SQRT( 0.02 M * 7.9 × 10 –5)

    = 0.0013 M

    pH = 2.9 .. 

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