Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: A5HLEY on March 27, 2008, 02:53:28 PM

Title: How do I start this pH problem?
Post by: A5HLEY on March 27, 2008, 02:53:28 PM

How do I start this pH problem?

A 26.09mL sample of .0621M potassium hydroxide is titrated with .142M perchloric acid solution. Calculate the pH after the following volumes of acid have been added to the original 26.09mL solution.

a). 104.10 mL
b). 113.10 mL
c). 114.00 mL

ANY help is appreciated! Thanks!

Title: Re: How do I start this pH problem?
Post by: Borek on March 27, 2008, 02:57:53 PM

http://www.chembuddy.com/?left=pH-calculation-questions&right=pH-of-mixture-q1

Title: Re: How do I start this pH problem?
Post by: AWK on March 28, 2008, 02:29:02 AM

For all these number you have a big excess of HClO4. Do stoichiometry, calculate an excess of HCLO4 in a fonal volume, and calculate pH of an excess of a strong acid

For 260.9 ml and b - 114.1 mL and c - over 114,1 mL
you have problem
a) an excess of NaOH
b) equivalent point
c) excess of HClO4