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Explanation & Answer
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
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