Chapter 12, Problem 12.104QP

Interpretation Introduction

Interpretation:

Molality and density of $15M$ phosphoric acid which has $85\%$ of its mass in solution have to be calculated.

Concept Introduction:

Mass percent is one of the parameters that is used to express concentration of a solution.  It is expressed as,

$\text{Mass percent of a solute = }\frac{mass\text{ of solute}}{mass\text{ of solution}}\times \text{ 100\%}$

Molarity is a term used to express concentration of a solution.  It is expressed as,

$\text{Molarity = }\frac{number\text{ of }molesof\text{ solute}}{volume\text{ of solution in L}}$

The term Molality is used to express concentration of a solution.  It is expressed as,

$\text{Molality = }\frac{number\text{ of }molesof\text{ solute}}{mass\text{ of solvent in kg}}$