Calculate the pH of the solution?

Chemistry
Tutor: None Selected Time limit: 1 Day

Apr 2nd, 2015

The equation for calculating the pH of a buffer solution is: 
Ka= [H30+ (aq)] [salt] / [Weak Acid] 

After inputting the values the equation looks like this: 
6.5 X 10^ -5= [H30+] [ 0.25]/ [ 0.2] 
[H3O+]= 5.2 X 10^-5 mol dm-3 

To find the Ph you can use: 
pH= -log10[H30+] 
= -log10 [5.2 X 10 ^-5] 
=4.3

Apr 2nd, 2015

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