3.4.7 Making insoluble salts

Question 1

What is a precipitate?

Answer 1

A precipitate is an insoluble solid that forms in a solution.

Question 2

What are the spectator ions in a precipitation reaction?

Answer 2

The ions formed that are not involved in making the precipitate.

Question 3

How to make insoluble salt crystals by precipitation?

Answer 3

• Mix the two solutions together. Each solution should contain one of the ions needed to make the precipitate.
• The salt precipitate will sink to the bottom.
• Filter out the salt precipitate. The residue is the salt we want to keep. the filtrate is the leftover solution.
• Rinse the salt with water. It doesn’t dissolve because it is insoluble.
• Dry the salt by dabbing it with a paper towel.