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Topic: Neutralization titration[graph]  (Read 3381 times)

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Offline marcus21

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Neutralization titration[graph]
« on: June 21, 2012, 10:03:47 AM »
I wanna know if this titration curve is good calculated and if the models are good.

Picture:
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Offline Borek

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Re: Neutralization titration[graph]
« Reply #1 on: June 21, 2012, 11:42:17 AM »
I don't like the very beginning of the curve and the equivalence point. pH after addition of 5 mL of base is wrong, should be 2.65, not 2.47. And equivalence point is off by over 2 pH units.

You can compare your results with these generated by the BATE - pH calculator. Feel free to use a free 30 days trial version.
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Offline marcus21

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Re: Neutralization titration[graph]
« Reply #2 on: June 21, 2012, 01:31:40 PM »
Hey tell me why is it wrong at 5 ml:

pH=pka+log[cs/ca]

2,47=3,745+log[0,5/9,5] my sample
Write equation. Please
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Offline Borek

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Re: Neutralization titration[graph]
« Reply #3 on: June 21, 2012, 04:56:18 PM »
There is no simple equation. When you calculate exact pH turns out formic acid is strong enough to dissociate a little bit more (your calculation was based on the assumption neutralization is solely responsible for the ratio of formic acid and formate). See this related post.
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