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The formula for calculating pH is:

pH = -log [H+]

 

We calculate the value of [H+] using the given Ka value:

Ka = [H+]*[A-] / [HA] 

Assuming that [H+] = [A-], therefore:

1.9 = [H+]^2 / 0.35

[H+] = 0.815

 

pH = -log [H+]

pH = -log 0.815

pH = 0.0886

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