- #1
carle
- 13
- 0
Hello! Two questions that I would like to get some help with. I'm translating these so I hope I get it right.
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.
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.