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A buffer solution contains 0.15 moles of...

A buffer solution contains 0.15 moles of acetic acid and 0.20 moles of potassium acetate per litre. The dissociation constant of acetic acid at room temperature is `1.76×10^(−5)`
Calculate the pH of the solution.

Text Solution

Verified by Experts

According to the Henderson.s equation,
`pH = pK_a +log_(10) (["Salt"])/(["Acid"]) `
Substituting the given values, we have
` pH = -log _(10 ) (1.76xx 10 ^(-5) ) +log_(10) ""(0.20)/(0.15)`
` = 4.7545 +0.1249 =4.8794`
Hence, the pH of the given solution is 4.8794.
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