11.7 making insoluble salts by precipitation

Question 1

which type of salts are soluble

Answer 1

All sodium, potassium, and ammonium salts.
all nitrates.
Chlorides.
Sulfates.
sodium, potassium, and ammonium carbonates.

Question 2

which type of salts are insoluble

Answer 2

except silver and lead chloride
except calcium, barium and lead sulfate
but all other carbonates are insoluble

Question 3

how can insoluble salts be made

Answer 3

by precipitation

Question 4

making insoluble salts with precipitation (barium sulfate an insoluble salt)

Answer 4

barium sulfate is an insoluble salt. You can make it by mixing a solution of barium chloride and magnesium sulfate:

1.) Barium chloride,BaCl2, contains barium ions and chloride ions.
2.)A solution of magnesium sulfate, MgSO4, has magnesium and sulfate ions.
3.)When you mix the two solutions, the barium and sulfate ions bond together. Barium sulfate forms as a precipitate.

Question 5

equation for barium chloride and magnesium sulfate

Answer 5

BaCl2 + MgSO4 –> BaSO4 +MgCl2

Ba2+ + SO4,2—> BaSO4

Question 6

ionic equation for barium chloride and magnesium sulfate

Answer 6

Ba2+ + SO4,2—> BaSO4

Question 7

the steps in making barium sulfate

Answer 7

1.)make up solutions of barium chloride and magnesium sulfate.
2.) mix them. a white precipitate of barium sulfate forms at once.
3.)filter the mixture. the precipitate is trapped in the filter paper.
4.)rinse the precipitate by running distilled water through it
5.)then place it in a warm oven to dry.

Question 8

how to precipitate an insoluble salt

Answer 8

You must mix a solution that contains its positive ions with one that contains its negative ions.

Question 9

uses of precipitation

Answer 9

-it is used to make colored pigments for paint
-used in places to remove harmful substances dissolved in water, when cleaning up waste water.
-it is used in making film, for photography. solution of silver nitrate and potassium bromide are mixed in gelatin. A precipitate of tiny crystals of insoluble silver bromide forms. the mixture is then coated onto clear film, giving photographic film. later when light strikes the film, the silver bromide will break down:
2AgBr –> 2Ag + Br2

Question 10

what’s a spectator ion

Answer 10

The ions which do not participate in chemical reactions and present the same on both sides of the reactions