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Finding pH of a mixture

How do you find the pH for this question? I’ve highlighted the answer. Thank you.

729CFB44-5C44-4F78-9735-EBC564B01E19.jpg.jpeg
Original post by at.midnight
How do you find the pH for this question? I’ve highlighted the answer. Thank you.

729CFB44-5C44-4F78-9735-EBC564B01E19.jpg.jpeg

see attachment for working out- you will see here Ka = [H+] so pH =pKa (half equivalence point)

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