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What is the pH of a 0.20 M HA solution (...

What is the pH of a 0.20 M HA solution `(K_a=1.0xx10^(-6))` that contains 0.40 M NaA ?

A

3.15

B

3.35

C

`5.70`

D

`6.30`

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The correct Answer is:
d
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