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Topic: Buffer solution  (Read 2446 times)

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Offline nicolodn

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Buffer solution
« on: October 01, 2010, 07:10:10 AM »
Calculate the pH of a buffer solution prepared by adding 0.379 mole of the sodium salt of a weak organic acid HA to 0.516 L of 0.992 M acid HA (with pKa = 4.96) and diluting to 1.00 L with water.

How?
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Offline Mr Lead

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Re: Buffer solution
« Reply #1 on: October 01, 2010, 08:13:09 AM »
Calculate molar concentration of sodium salt after diluition (n/Vtot);
Calculate molar concentration of weak acid after diluition (n/Vtot);
Apply Henderson-Hasselbalch equation to calculate molar concentration of H3O+ ---> then pH

:)
 
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Offline nicolodn

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Re: Buffer solution
« Reply #2 on: October 01, 2010, 08:15:42 AM »
Quote from: Mr Lead on October 01, 2010, 08:13:09 AM
Calculate molar concentration of sodium salt after diluition (n/Vtot);
Calculate molar concentration of weak acid after diluition (n/Vtot);
Apply Henderson-Hasselbalch equation to calculate molar concentration of H3O+ ---> then pH

:)
 

I did that but I got 4.83 and it's not the right answer....
Could you show me using the numbers in it? if it isn't the right answer.
Thanks
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Offline AWK

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Re: Buffer solution
« Reply #3 on: October 01, 2010, 10:35:16 AM »
You got a correct answer for these data.
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AWK
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