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February 27, 2015

Homework Help: Chemistry

Posted by Amy on Wednesday, August 4, 2010 at 10:03am.

Hi,
I am having trouble with two questions.

Find the pH of the following aqueous solutions prepared by adding:

a) 20mL 0.12M HCl to 10mL 0.16M CH3COOH + 20mL 0.20 KOH.

b) 10mL 5.0x10^-7 M HCl to 90mL H2O

For a), I thought it was a buffer solution so what I tried to do was find the initial moles and add or subtract the moles of HCl (as it reacts with the conjugate base to create more conjugate acid). But then I realised that CH3COOH and KOH were not conjugate pairs. So what do I do?

For b), I tried using M1V2 = M2V2 but the sheet said that "the trivial answer to this is not correct". So how do I do this ?

Thanks for your time.

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