A solution is 5 mM in each of the following ions:
| number | ion | Ksp of M(OH)2 |
| 1 | Mg2+ | 1.8e-11 |
| 2 | Cd2+ | 2.5e-14 |
| 3 | Co2+ | 1.6e-15 |
| 4 | Zn2+ | 4.4e-17 |
| 5 | Cu2+ | 2.2e-20 |
Indicate which of the metal ions would precipitate (or start toprecipitate) at each of the following pH values. Indicate youranswer with the number of the ion. Use 0 to indicate noprecipitate. If more than one precipitate is expected, list thenumbers in increasing order and separate them with commas. Forexample, 3,4,5 is ok but 5,4,3 is not.
pH = 5.00:
pH = 9.00:
What is the pH to the nearest 0.1 pH unit at whichMg(OH)2 begins to precipitate?
pH =
