Tests

Question 1

How do you test for ammonia gas?

Answer 1

• expose to damp litmus paper
• turns blue

Question 2

How do you test for ammonium ion?

Answer 2

• add to an unknown salt
• expose the gas produces to damp red litmus paper
• turns blue

Question 3

What is the chemical test for water?

Answer 3

• add water to anhydrous copper sulphate
• creates hydrated copper sulphate
• this is blue

Question 4

What is the physical test for water?

Answer 4

• see if it melts at 0 degrees
• see if it boils at 100 degrees
• if it does it is pure water

Question 5

How do you test for iron(II) and (III)

Answer 5

Add sodium hydroxide
Green precipitate is iron(II)
Brown precipitate is iron(III)

Question 6

What colour is litmus paper in acidic solution?

Answer 6

Red