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An unknown solution does not form a precipitate when sulfate ions are added but does when hydroxide is added. the cation present could be which of the following?

a. Mg²⁺
b. Ca²⁺
c. K⁺
d. Li⁺

User HuorSwords
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1 Answer

3 votes

Final answer:

The cation that could be present is calcium ion (Ca²⁺) because calcium hydroxide precipitates when hydroxide is added, while calcium sulfate remains soluble in water. The correct answer is option: b. Ca²⁺

Step-by-step explanation:

The cation that could be present in a solution that does not form a precipitate with sulfate ions but does with hydroxides is calcium ion (Ca²⁺). This is because calcium sulfate (CaSO₄) is relatively soluble in water and does not easily form a precipitate, whereas calcium hydroxide (Ca(OH)₂) is less soluble and will precipitate when sodium hydroxide is added to a solution containing calcium ions.

The other cations listed, such as Mg²⁺, K+, and Li+, are not consistent with the observations provided, as magnesium also forms a precipitate with hydroxide ions and potassium and lithium do not typically form precipitates with hydroxide ions due to their higher solubility in water.

User Leecbaker
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