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Calculate the pH of a buffer containing 0.08 mole of acetic acid and 0.12 mole of sodium acetate per dm_2 of the solution. The ionisation constant of acetic acid is 1.8xx10^-5. |
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Answer» SOLUTION :The pH of a buffer solution is GIVEN by the Henderson's equation . `pH=pK_a+log.(["SALT"])/(["ACID"])` `pK_a=-logK_a=-log[1.8xx10^(-5)]` `=log.(1)/(1.8xx10^(-5))` `=log 1-log1.8-log 10^(-5)` `=5-0.2553` `=4.7447` `pH=4.7447+log.(0.12)/(0.08)` `4.7447+log1.5` `=4.7447 +0.1761` `pH=.921.` |
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