Chapter 18, Problem 123A

Interpretation Introduction

Interpretation:

The trend in the average $pH$ for the years $1990-2003$ is to be written.

Concept introduction:

The trend in average $pH$ can be seen using $pH$ Vs year graph given in question.

Answer to Problem 123A

$pH$ is increasing nearly from $4.25$ to approximately $4.55$

Explanation of Solution

The pink dots are representing average value of particular year which shows $pH$ is increasing nearly from $4.25$ to approximately $4.55$

Conclusion

Thus $pH$ is gradually increasing in years $1990-2003$