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Topic: How many mL of NaOH solution required to reach endpoint?  (Read 6875 times)

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Offline daylight

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How many mL of NaOH solution required to reach endpoint?
« on: April 14, 2009, 12:54:17 PM »
How many mL of NaOH solution required to reach endpoint?

0.497g of propanoic acid is titrated with 0.097 M NaOH. Ka=1.3x10~ How many mL of sodium hydroxide solution would be required to reach endpoint?
Find the pH in the titration at the equivalence point.hmm seems part is missing, but I can fix that if I know how to do it. I don't think my formula is right...

this is what I did, but I think maybe it should be common ion? then ice?
C2H5COOH + NaOH = C2H5COO- + H2O + Na, but maybe the C2H5COO needs to be common ion? I'm not sure either what to do with the propanoic acid in grams since I don't have mL to convert it to molarity. *delete me*?? :-)

endpoint... and equivalence point. Can I just assume 1 Liter to get molarity?
« Last Edit: April 14, 2009, 01:06:41 PM by daylight »

Offline Borek

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Re: How many mL of NaOH solution required to reach endpoint?
« Reply #1 on: April 14, 2009, 01:00:16 PM »
How many mL of sodium hydroxide solution would be required to reach endpoint?

Endpoint? Or equivalence point? In the latter case this a VERY simple simple stoichiometry. Check propanoic acid formula. In the first case - without information about how the endpoint was detected, you won't get far. See

http://www.titrations.info/titration-basic-terms

for both definitions.

Quote
Find the pH in the titration at the equivalence point.

This will be pH of a solution of a weak acid salt.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline daylight

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Re: How many mL of NaOH solution required to reach endpoint?
« Reply #2 on: April 14, 2009, 02:16:54 PM »
OK I believe it is 1.3x10-5. I wondering if maybe this is a C1V1 problem... hmmm

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