Acids and Bases

Question 1

What are acids?

Answer 1

Acids are substances which ionize (form ions) in water to produce hydrogen ions.

The more of these ions produced, the more acidic the solution.

Question 2

What are bases?

Answer 2

Substances which produce OH- ions in water.

They have a soapy feel and are bitter in taste.

Question 3

What are Alkali or alkaline Solution?

Answer 3

It is a base that can dissolve in water.

Question 4

What is a Neutralisation Reaction?

Answer 4

When an acid reacts with a base to form a salt plus water

Question 5

What is an acid + metal reaction?

Answer 5

Acids react with reactive metals to produce a salt and hydrogen gas.

Question 6

What is an acid + carbonate reaction?

Answer 6

When an acid reacts with a metal carbonate to produce a salt + water + carbon dioxide

Question 7

What is the pH scale?

Answer 7

It measures the concentration of H+ ions in solutions.
Neutral = 7
basic (alkali) > 7
Acidic < 7

Question 8

What is Indicator?

Answer 8

Indicators are substances that change colour at different pH levels, helping us quickly estimate a solution’s pH.