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You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate....Asked by Adam
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.180 M sodium benzoate
How much of each solution should be mixed to prepare this buffer?
How much of each solution should be mixed to prepare this buffer?
Answers
Answered by
DrBob222
Let x = mL benzoate
Then 100-x = mL acid
--------------------
millimols base = x*0.180
mmoles acid = (100-x)*0.1
4.00 = 4.20 + log(0.180x)/[(100-x)*0.1]
Solve for x and 100-x
I get 26 something for base and about 74 for acid. You should do it more accurately.
Then 100-x = mL acid
--------------------
millimols base = x*0.180
mmoles acid = (100-x)*0.1
4.00 = 4.20 + log(0.180x)/[(100-x)*0.1]
Solve for x and 100-x
I get 26 something for base and about 74 for acid. You should do it more accurately.
Answered by
Hassan
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Answered by
Hassan
Ineed helping full for account