EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of barium nitrate solution is added to a solution of the solid. A precipitate forms. What colour will the precipitate be?

Important Questions on In the Lab

MEDIUM
Upper Secondary: IGCSE
IMPORTANT

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of barium nitrate solution is added to a solution of the solid. A precipitate forms. Name the precipitate and explain why it forms?

EASY
Upper Secondary: IGCSE
IMPORTANT

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of barium nitrate solution is added to a solution of the solid. A precipitate forms which will disappear if dilute nitric acid is added. Why?

MEDIUM
Upper Secondary: IGCSE
IMPORTANT

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of silver nitrate solution is added to the solution of the solid. A precipitate forms. What colour will this precipitate be?

MEDIUM
Upper Secondary: IGCSE
IMPORTANT

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of silver nitrate solution is added to the solution of the solid. A precipitate forms. This precipitate confirms the presence of impurity. Explain why.

EASY
Upper Secondary: IGCSE
IMPORTANT

A sample of potassium salt was contaminated with potassium chloride. The tests were carried out on the contaminated sample.

TEST: An equal volume of silver nitrate solution is added to the solution of the solid. A precipitate forms. Give the formulae for both the potassium salt and the impurity.

EASY
Upper Secondary: IGCSE
IMPORTANT

Two solutions W and Y are tested with universal indicator paper.

Solution W: the indicator paper turns red
Solution Y: the indicator paper turns orange

Which solution could have a pH of 1, and which could have a pH of 5?

EASY
Upper Secondary: IGCSE
IMPORTANT

Two solutions W and Y are tested with universal indicator paper.

Solution W: the indicator paper turns red
Solution Y: the indicator paper turns orange

Which type of solution is Y?

EASY
Upper Secondary: IGCSE
IMPORTANT

Two solutions W and Y are tested with universal indicator paper.

Solution W: the indicator paper turns red
Solution Y: the indicator paper turns orange

Further tests are carried out in test tubes. A piece of magnesium is added to solution W. What will you observe in the test tube?