Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO₄(aq) + (NH₄)₃PO₄(aq) $\to$

Question

Quizplus · Accepted Answer

The reactants are cobalt(II) sulfide (CoS) and ammonium phosphate [(NH4)3PO4]. Combining these yields cobalt(II) phosphate [Co3(PO4)2], which has the chemical formula CoS(PO4)2. The correct formula for the precipitate should reflect the presence of both cobalt and phosphate ions and the correct oxidation state for cobalt in this compound is +2, eliminating choices B and D. Choice E is incorrect because it is the formula for one of the starting materials, ammonium sulfate. Thus, the correct choice is A.

Select the Correct Name and Chemical Formula for the Precipitate →\to→

Select the Correct Name and Chemical Formula for the Precipitate $\to$