SC8g Solubility

Question 1

precipitation reaction?

Answer 1

soluble substances react to form an insoluble solid

Question 2

what is an insoluble solid called?

Answer 2

precipitate

Question 3

what is soluble in water?

Answer 3

~all common sodium, potassium and ammonium salts
~all nitrates
~most chlorides
~most sulfates
~sodium, potassium and ammonium carbonates
~sodium, potassium and ammonium hydroxides

Question 4

what is insoluble in water?

Answer 4

~silver, lead chlorides
~lead, barium, calcium sulfates
~most carbonates
~most hydroxides

Question 5

how is a pure dry sample of an insoluble salt prepared?

Answer 5

~wear goggles
~mix the 2 solutions in a beaker and filter the mixture
~rinse the beaker with a little distilled water and pour this through the funnel
~pour a little distilled water over the precipitate in the funnel
~carefully remove the filter paper containing the precipitate and dry it in a warm oven

Question 6

what is the precipitate?
lead nitrate + sodium chloride → lead chloride + sodium nitrate

Answer 6

lead chloride

Question 7

explain why the beaker is rinsed with a little distilled water and the washings are poured through the funnel?

Answer 7

to rinse out any precipitate left inside the beaker

Question 8

explain why distilled water is poured over the precipitate in the funnel?

Answer 8

to wash the precipitate and remove any soluble product