You are Here: Home

# pH question!! Watch

1. A titration was carried out where 40cm3 of 0.1 moldm-3 NaOH was added to 25cm3 of Ethanoic acid. The Pka of the reaction was 4.60 and the value of ka= 2.51 X 10-5 moldm-3 and the equivalence point= 23.83cm3. Calculate the concentration of ethanoic acid .

2. Is this A-level?
3. (Original post by klgyal)
A titration was carried out where 40cm3 of 0.1 moldm-3 NaOH was added to 25cm3 of Ethanoic acid. The Pka of the reaction was 4.60 and the value of ka= 2.51 X 10-5 moldm-3 and the equivalence point= 23.83cm3. Calculate the concentration of ethanoic acid .

I posted a load of crap earlier on - I didn't actually read the question!

Write out the equation for the reaction.
Calculate moles of each from MV to find M for ethanoic acid.

The values of pKa and Ka are utterly meaningless for this question.
4. (Original post by charco)
I posted a load of crap earlier on - I didn't actually read the question!

Write out the equation for the reaction.
Calculate moles of each from MV to find M for ethanoic acid.

The values of pKa and Ka are utterly meaningless for this question.
Well it's an acid-base reaction so think about the transfer of protons between ethanoic acid and sodium hydroxide for the equation.

What is MV and M?? If you just want to find the moles use the formula of CV/1000 and rearrange accordingly.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: December 19, 2010
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.