Final answer:
The compounds are ranked from least to most soluble based on their Ksp values: calcium phosphate, calcium fluoride, calcium carbonate, calcium sulfate, and finally calcium hydroxide.
Step-by-step explanation:
To rank the compounds calcium fluoride, calcium phosphate, calcium hydroxide, calcium carbonate, and calcium sulfate in order of increasing molar solubility using their solubility product constants (Ksp), one must consider that a lower Ksp generally indicates a lower solubility. Given the Ksp values, we can determine this order:
- Calcium phosphate (Ksp = 2.1×10⁻³³)
- Calcium fluoride (Ksp = 3.9×10⁻¹¹)
- Calcium carbonate (Ksp = 5.0×10⁻⁹)
- Calcium sulfate (Ksp = 7.1×10⁻⁵)
- Calcium hydroxide (Ksp = 4.7×10⁻⁶)
The order is from the least soluble (lowest Ksp) to the most soluble (highest Ksp). Remember that the actual solubility can be influenced by factors such as the presence of common ions or changes in pH.