Question

Match each substance with its correct definition.

Answer 1

A-3 --> neutral is a substance with a pH of 7
b-2--> base is a substance with a pH of 10
c-1--> acid is a substance with a pH of 3
d-5--> pH scale is a scale that represents the concentration of H₃O⁺, 0-14
e-4--> phenolphthalein is an indicator

Answer 2

Explanation:

pH is defined as the measure of hydrogen ion in a solution. It ranges from 0 to 14. A solution having a pH range from 0 to 6.9 is known as acidic solution and the solution which have a pH range from 7.1 to 14 is known as basic solution.

The solution having a pH of 7 is known as neutral solution.

• For a: neutral

A neutral substance always have a pH of 7.

• For b: base

A basic substance has a pH range of 7.1 to 14. So the correct answer is it has a pH of 10.

• For c: acid

An acidic substance has a pH range of 0 to 6.9. So, the correct answer is it has a pH of 3.

• For d: pH scale

This scale lies in the pH range of 0 to 14 and it measures the concentration of hydrogen ion or hydronium ions in a solution.

• For e: phenolphthalein

This substance is an indicator and it tells the acidity or basicity of a solution. Hence, the correct answer is an indicator.