Chapter 11, Problem 11.46SP

(a)

Interpretation Introduction

Interpretation:

The concentration of Propranolol is given as $50ng/L$ and it has to be expressed in parts per billion.

Concept introduction:

Parts Per Billion refers to a term that expresses concentration of certain substance in a mixture of substances.   It is denoted as ppb.  It is represented as,

$ppb\text{ = }\frac{mass\text{ of substance}}{mass\text{ of sample}}\times {10}^9$

In solution concentrations, $1\text{ ppb}$ is equivalent to $1\text{ ng/mL or 1 }\mu \text{g/L}\text{.}$

(b)

Interpretation Introduction

Interpretation:

The concentration of Propranolol is given as $50ng/L$ and it has to be expressed in molarity.

Concept introduction:

Parts Per Billion refers to a term that expresses concentration of certain substance in a mixture of substances.   It is denoted as ppb.  It is represented as,

$ppb\text{ = }\frac{mass\text{ of substance}}{mass\text{ of sample}}\times {10}^9$

In solution concentrations, $1\text{ ppb}$ is equivalent to $1\text{ ng/mL or 1 }\mu \text{g/L}\text{.}$

Molarity is a concentration term that is used to express the concentration of the solute in solution.  It is represented as,

$molarity\text{ = }\frac{no.of\text{ moles of solute}}{volume\text{ of solution in L}}$