Chapter 3, Problem 3.18P

(a)

Interpretation Introduction

Interpretation:

The formula mass of $\text{NaCl}$ is $58.442\pm 0.006\text{ g/mol}$ has to be shown

Concept Introduction:

Uncertainty:

Uncertainty means state of not certain in predicting a value.  In a measured value, the last digit will have associated uncertainty. Uncertainty has two values, absolute uncertainty and relative uncertainty.

Absolute uncertainty:

Expressed the marginal value associated with a measurement

Relative uncertainty:

Compares the size of absolute uncertainty with the size of its associated measurement

$\text{Relative uncertainty = }\frac{\text{absolute uncertainty}}{\text{magnitude of measurement}}$

To Show: The formula mass of $\text{NaCl}$ is $58.442\pm 0.006\text{ g/mol}$

(b)

Interpretation Introduction

Interpretation:

The uncertainty in the molarity of $\text{NaCl}$ has to be calculated.

Concept Introduction:

Uncertainty:

Uncertainty means state of not certain in predicting a value.  In a measured value, the last digit will have associated uncertainty. Uncertainty has two values, absolute uncertainty and relative uncertainty.

Absolute uncertainty:

Expressed the marginal value associated with a measurement

Relative uncertainty:

Compares the size of absolute uncertainty with the size of its associated measurement

$\text{Relative uncertainty = }\frac{\text{absolute uncertainty}}{\text{magnitude of measurement}}$

To Calculate: The absolute uncertainty in the molarity of $\text{NaOH}$