Describe how to prepare hydrogen gas in the lab.
Important Questions on In the Lab
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?
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?
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?
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?
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.
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.
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 of , and which could have a of ?
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?
