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Calculate the pH of a solution of given ...

Calculate the `pH` of a solution of given mixture.
a. `(2g CH_(3)COOH +3g CH_(3) COONa)` in `100mL` of mixture.
b. `5mL` of `0.1M NH_(4)OH + 250mL of 0.1 M NH_(4)C1`.
c. `(0.25 "mol of" CH_(3)COOH + 0.35 "mol of" CH_(3) COONa)` in `500mL` mixture.
`K_(a) "of" CH_(3)COOH = 1.8 xx 10^(-5) (pK_(a) = 4.7447)`
`K_(b) "of" NH_(4)OH = 1.8 xx 10^(-5) (pK_(b) = 4.7447)`

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