Chapter 4, Problem 4.83QP

Interpretation Introduction

Interpretation: The amount of $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}$ required to remove $90\%$ of the ${\text{PO}}_4^{3-}$ from the drinking water is to be calculated.

Concept introduction: Calcium hydroxide is an inorganic compound with chemical formula $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}$. It is white powder and obtained by mixing, or slaking water with calcium oxide.

It is used as flocculant in water and sewage treatment. It is also used in paper industry.

To determine: The amount of $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}$, required to remove $90\%$ of the ${\text{PO}}_4^{3-}$ from the drinking water.