A) Without doing any calculations (just compare the correctKsp values) complete the following statements:
| 1. | calcium sulfide is | MORE soluble than | ABCD? | |
| 2. | calcium sulfide is | LESS soluble than | ABCD? | |
| | A. MgCO3 |
| | B. CaCO3 |
| | C. Fe(OH)2 |
| | D. Pb(OH)2 |
B) For each of the salts on the left, match the salts on the rightthat can be compared directly, using Ksp values, toestimate solubilities. If more than one answer is correct, enterthe letters without delimiting characters.
| 1. | calciumsulfite | Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | A.Ag2CO3 |
| 2. | nickel(II)hydroxide | | B.Ba3(PO4)2 |
| | | | C. AgCN |
| | | | D. PbS |
Write the expression for Ksp in terms of the solubility,s, for each salt, when dissolved in water.
calcium sulfite | Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | nickel(II) hydroxide |
Ksp = | | | Ksp = | |
Note: Multiply out any number and put it first in theKsp expression. Combine all exponents for s.
C) Determine the relative solubilities of the followingmagnesium compounds:
| Compound | Ksp | Relative Solubility, M |
|---|
MgCO3 | 4.0×10-5 | lowest / intermediate / highest |
MgF2 | 6.4×10-9 | lowest / intermediate / highest |
Mg(OH)2 | 1.5×10-11 | lowest / intermediate / highest |
