Based on Table F, which compound is most soluble in water?
- Dec 9, 2025
- 1 min read
Regents Chemistry Exam August 2025 Question 40
Based on Table F, which compound is most soluble in water?
(1) CaS
(2) CaCO3
(3) CaSO4
(4) CaCrO4
Solution:
Table F shows solubility for different compounds. Let's go one by one: CaS = sulfide S is insoluble unless combined with Group 1 ions or NH4+. Since Ca is in group 2, CaS in insoluble. CaCO3 = CO3^2- is insoluble unless combined with Group 1 ions or NH4+. Therefore, it is insoluble. CaSO4= SO4^2- is soluble unless combined with Ca^2+ and others listed, therefore CaSO4 is insoluble. CaCrO4 = CrO4 is insoluble unless combined with Group 1, Ca^2+, Mg^2+ and NH4+. Therefore, CaCrO4 is soluble. Choice 4 is the correct answer.
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