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Topic: Prepare Buffer of Given pH by Acid/Base Reaction  (Read 2336 times)

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Offline dennyben

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Prepare Buffer of Given pH by Acid/Base Reaction
« on: May 17, 2012, 06:59:02 PM »
An aqueous solution contains 0.423 M hydrocyanic acid.

How many mL of 0.325 M potassium hydroxide would have to be added to 225 mL of this solution in order to prepare a buffer with a pH of 9.250 ?

ANSWER: >>  120mL  <<
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Offline Sophia7X

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Re: Prepare Buffer of Given pH by Acid/Base Reaction
« Reply #1 on: May 17, 2012, 08:01:34 PM »
Use your good friend, the Henderson-Hasselbalch equation :D
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Offline dennyben

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Re: Prepare Buffer of Given pH by Acid/Base Reaction
« Reply #2 on: May 17, 2012, 08:41:53 PM »
Quote from: Sophia7X on May 17, 2012, 08:01:34 PM
Use your good friend, the Henderson-Hasselbalch equation :D

I have been fooling around with this good friend and he doesn't seem to be going anywhere near the answer.
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Offline Borek

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Re: Prepare Buffer of Given pH by Acid/Base Reaction
« Reply #3 on: May 18, 2012, 02:43:53 AM »
What happens when you add strong base to the solution of an acid?
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