Question

1. what is the molar concentration of sodium ions in a 0.750 m na3po4 solution?

a) 3.00 m b) 0.750 m c) 0.250 m d) 2.25 m

Explanation:

Step1: Analyze the dissociation of \(Na_3PO_4\)

\(Na_3PO_4\) dissociates as \(Na_3PO_4 = 3Na^+ + PO_4^{3 -}\).

Step2: Calculate the molar concentration of \(Na^+\)

From the dissociation equation, 1 mole of \(Na_3PO_4\) gives 3 moles of \(Na^+\). Given \([Na_3PO_4]=0.750\ M\), then \([Na^+]=3\times[Na_3PO_4]\).
Substitute the value: \([Na^+]=3\times0.750\ M = 2.25\ M\).

Answer:

D. \(2.25\ M\)