Practical Testing of Acids and Bases

Question 1

How does phenolphthalein behave in acids and bases?

Answer 1

It is colorless in acids and pink in bases​

Question 2

How does litmus paper indicate the presence of acids and bases?

Answer 2

Red in acids and blue in bases​

Question 3

What is a universal indicator?

Answer 3

A mixture of different indicators that gives a color based on the strength of an acid or base

Question 4

How is a universal indicator used to test pH?

Answer 4

Add two drops of universal indicator to a sample, observe the color change, and match it with the pH scale​

Question 5

How can you distinguish between strong and weak acids using magnesium metal?

Answer 5

Strong acids produce a higher volume of hydrogen gas compared to weak acids when reacted with magnesium​

Question 6

Describe the steps to measure the strength of acids using magnesium and gas production

Answer 6

Cut and measure a piece of magnesium ribbon.
React it with equal volumes of acids in separate flasks.
Collect and measure hydrogen gas produced using a gas syringe within a set time​

Question 7

Why are strong acids and bases better conductors of electricity?

Answer 7

They ionize completely in solution, producing a high concentration of ions for efficient current flow​

Question 8

Why do weak acids and bases have lower conductivity?

Answer 8

They only partially ionize in solution, resulting in fewer ions to conduct electricity​