# For each of the following, state whether the solution at 25°C is acidic, neutral, or basic: a A 0.1 M solution of trisodium phosphate, Na 3 PO4, has a pH of 12.0. b A 0.1 M solution of calcium chloride, CaCl 2 , has a pH of 7.0 c A 0.2 M solution of copper(II) sulfate, CuSO 4 , has a pH of 4.0. d A sample of rainwater has a pH of 5.7.

### General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343

### General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343

#### Solutions

Chapter
Section
Chapter 15, Problem 15.66QP
Textbook Problem

## For each of the following, state whether the solution at 25°C is acidic, neutral, or basic: a A 0.1 M solution of trisodium phosphate, Na3PO4, has a pH of 12.0. b A 0.1 M solution of calcium chloride, CaCl2, has a pH of 7.0 c A 0.2 M solution of copper(II) sulfate, CuSO4, has a pH of 4.0. d A sample of rainwater has a pH of 5.7.

Expert Solution
Interpretation Introduction

Interpretation:

Whether the given solution is acidic, neutral, or basic has to be determined.

Concept introduction:

pH is an logarithmic expression to express a solution is acidic, basic or neutral.  pH scale lies values between 1-14 and on which 7 is neutral, below 7 values are more acidic in nature and above 7 values are more basic in nature.

• The concentration of hydronium ion of a solution is greater than 1.0 × 107 the solution is acidic.
• The concentration of hydronium ion of a solution is less than 1.0 × 107 the solution is acidic.
• The concentration of hydronium ion of a solution is equal to 1.0 × 107 the solution is neutral.

### Explanation of Solution

(a)

The given pH of the solution is 12.0

We know that, the value of pH is greater than 7 is said to be basic,

Hence, the given solution is basic.

(b)

The given pH of the solution is 7.0

We know that, the value of pH is equal to 7 is said to be neutral,

Hence, the given solution is neutral

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