“Mass of sodium phosphate is required for removal of Ca +2 and Mg +2 from a 1.5L solution” should be identified. Concept introduction: The phosphate ions react with Ca +2 and Mg +2 ions as: 3CaCl 2 + 2Na 3 PO 4 → Ca 3 (PO 4 ) 2 (s)+6NaCl 3Mg(NO 3 ) 2 + 2Na 3 PO 4 → Mg 3 (PO 4 ) 2 (s)+6NaNO 3 Given: Molarity of calcium chloride is 0.050 M Molarity of magnesium nitrate is 0.085 M Volume of hard water is 1.5 L Molar mass of sodium phosphate is 163.94 g m o l e

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Chapter 8, Problem 87E

Interpretation Introduction

Interpretation:

“Mass of sodium phosphate is required for removal of Ca⁺² and Mg⁺² from a 1.5L solution” should be identified.

Concept introduction:

The phosphate ions react with Ca⁺² and Mg⁺² ions as:

3CaCl₂ + 2Na₃PO₄ → Ca₃(PO₄)₂ (s)+6NaCl

3Mg(NO₃)₂ + 2Na₃PO₄ → Mg₃(PO₄)₂(s)+6NaNO₃

Given:

Molarity of calcium chloride is 0.050M

Molarity of magnesium nitrate is 0.085M

Volume of hard water is 1.5 L

Molar mass of sodium phosphate is 163.94 $\frac{g}{m o l e}$

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