Chapter 6, Problem 88A

(a)

Interpretation Introduction

Interpretation: To determine the no. of significant digits in the given number.

Concept introduction:

The number of digits that contributes to the degree of accuracy of the measurement is known as significant figures. It shows the precision of the measurement.

Answer to Problem 88A

3

Explanation of Solution

All non-zero digits in any number are considered significant digits.

The given number is $31.8\text{ mL}$ .

Thus, the number of significant digits is 3.

(b)

Interpretation Introduction

Interpretation: To identify the uncertain digit in the given number.

Concept introduction:

The number of digits that contributes to the degree of accuracy of the measurement is known as significant figures. It shows the precision of the measurement.

Answer to Problem 88A

8

Explanation of Solution

An estimate or guess of the object's location between the closest graduations is an "uncertain digit." As a result, in a measurement that is accurately reported, the last digit is important but uncertain. The given number is $31.8\text{ mL}$ .

Thus, uncertainty lies in the last digit 8.