Homework Answers
Question 2.
Given that [Ca2+] = [salt] = 0.26 M
pH = 8.78, i.e. [H+] = 10-8.78 M
Now, [H+] = (Kw * Ka/[salt])1/2
i.e. 10-8.78 = (10-14 * Ka/0.26)1/2
i.e. 10-17.56 = 10-14 * Ka/0.26
Therefore, Ka = 7.16*10-5
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