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**1. The solubility of cobalt(II)hydroxide is 5.4*10^-6 moles/dm^3 in water.**

i) What is the solubility product?

ii) What is the solubility of cobalt(II)hydroxide if pH is buffered to 10.43?

In i) I've calculated Ks to 6.3*10^-16 which is correct. The answer in ii) is 8.6*10^-9.

**2. pH in a saturated magnesium hydroxide solution is 10.52. Calculate the solubility product for magnesium hydroxide.**

The answer is 1.8*10^-11.

I've tried to solve them for a long time but I can't get it right. I need some help on how to approach problems like these.