Salts 🧂

Question 1

What colour is Phenolphthalein in acid, neutral, and alkali?

Answer 1

Acid-colourless
Neutral-colourless
Alkali-pink

Question 2

What colour is litmus paper in acid, neutral, and alkali?

Answer 2

Acid-red
Neutral-violet
Alkali-blue

Question 3

What colour is methyl orange in acid, neutral, and alkali?

Answer 3

Acid-red
Neutral-yellow
Alkali-yellow

Question 4

What is a titration reaction?

Answer 4

Titration is a technique that measures the volumes of acid and alkali solutions that are needed in a neutralisation reaction.

Question 5

When are salts formed?

Answer 5

When a metal replaces the hydrogen in an acid.

Question 6

What is the chemical formula for sulphuric acid?

Answer 6

H2SO4.

Question 7

What is the chemical formula for nitric acid?

Answer 7

HNO3.

Question 8

What is the chemical formula for hydrochloric acid?

Answer 8

HCl

Question 9

Metal + acid = ?

Answer 9

Salt + hydrogen.

Question 10

Metal oxide + acid =?

Answer 10

Salt + water.

Question 11

Metal hydroxide + acid =?

Answer 11

Salt + water.

Question 12

Metal carbonate + acid =?

Answer 12

Salt + water + carbon dioxide.

Question 13

What charge does chloride have?

Answer 13

Cl (-)

Question 14

What charge does sulphate have?

Answer 14

SO4 (2-)

Question 15

What charge does nitrate have?

Answer 15

NO3 (-)

Question 16

What is meant by ‘soluble’ and ‘insoluble’ and give 2 examples for each?

Answer 16

Soluble= substances that dissolve in water. Eg sugar and salt.
Insoluble=substances that do not dissolve in water. Eg metals and oil (and sand).