Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: slutsavenue on September 30, 2013, 03:58:29 AM
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A sodium acetate-acetic acid buffer solution was prepared by adding 0.020 M HCl solution to 500 ml
of 0.020 M Ch3COONa and then diluting the mixed solution to 1.0L. Calculate the original volume of the
HCl solution needed to prepare a buffer solution of pH 5.00.
The given answer is 180ml.
How do I derive the original volume of HCL solution needed to prepare the buffer solution? I used the henderson hesselberg equation in attempt to solve this answer but can't seem to get the given answer.
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http://www.chembuddy.com/?left=buffers&right=composition-calculation
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the allegedly correct answer "180 mL " is WRONG
taking 4.75 as pKa for acetic acid , the correct answer would have to be 281,17 mL ~ 280 mL
regards
Ingo
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the allegedly correct answer "180 mL " is WRONG
taking 4.75 as pKa for acetic acid , the correct answer would have to be 281,17 mL ~ 280 mL
180 mL is perfectly correct, please stop confusing people.