Question

chemistry 20 stoichiometry quiz
name: ebtesam
multiple choice

1. nabr(aq) + cu3(po4)2(aq) →? +?

the products of the above equation are:
□ na3po4(aq) + cubr2(aq)
□ cubr2(s) + na3po4(aq)
□ na3po4(aq) + cubr(aq)
□ cubr(s) + na3po4(aq)

Explanation:

Step1: Identify reaction type

This is a double - displacement reaction. In a double - displacement reaction of the form \(AB + CD
ightarrow AD+CB\), where \(A = Na^+\), \(B = Br^-\), \(C = Cu^{2 +}\), and \(D=PO_{4}^{3 -}\).

Step2: Determine correct products

The balanced chemical equation for the reaction \(3NaBr(aq)+Cu_3(PO_4)_2(aq)
ightarrow Na_3PO_4(aq)+3CuBr_2(s)\). Copper(II) bromide (\(CuBr_2\)) is insoluble in water and forms a solid precipitate, while sodium phosphate (\(Na_3PO_4\)) remains in aqueous solution.

Answer:

B. \(CuBr_2(s)+Na_3PO_4(aq)\)