A certain weak acid, HA, has a Ka value of 7.3

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Chemistry

A certain weak acid, HA, has a Ka value of7.3

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Part A

HA -------------------------------------> H^{+Â Â Â Â Â Â Â Â Â Â Â Â} +Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â A^-

0.1Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â initially

0.1 (1- y)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.1 yÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.1 y

K_a = 0.1 y^{2Â Â Â Â Â Â Â Â Â Â} because for weak acid y <<<<<1

K_a = 7.3 x 10^-7 so y = 2.7 x 10^-3

Percentage of ionization is 0.27

Case B

y = 8.54 x 10 ^-3

Percentage of ionization is 0.85

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