Making Insoluble Salts

Question 1

what does how you make a salt depend on

Answer 1

whether its soluble or insoluble

Question 2

what are the two ways a salt can form as when two solutions are mixed

Answer 2

• a precipitate

- or in solution

Question 3

what salts form as a precipitate or in a solution

Answer 3

• insoluble salts form as a precipitate

- soluble salts form in solution

Question 4

are common salts of sodium, potassium and ammonium soluble or not

Answer 4

they are soluble

Question 5

are nitrates soluble or not

Answer 5

they are soluble

Question 6

are common chlorides soluble or not

Answer 6

• they are soluble

- except silver and lead chloride

Question 7

are common sulfates soluble or not

Answer 7

• they are soluble

- except lead, barium and calcium sulfate

Question 8

are common carbonates and hydroxides soluble or not

Answer 8

• they are insoluble

- except sodium, potassium and ammonium ones

Question 9

what do you use a precipitation reaction for

Answer 9

making a pure and dry sample of an insoluble salt

Question 10

how do you make an insoluble salt

Answer 10

by picking two soluble salts and reacting them together to form an insoluble salt

Question 11

what would you make when mixing lead nitrate and sodium chloride

Answer 11

lead nitrate + sodium chloride = lead chloride + sodium nitrate

Question 12

what is the full method of making an insoluble salt

Answer 12

• add a spatula of both soluble substances into each test tube and add water to dissolve it
• tip two solutions into a small beaker and mix it
• the insoluble salt should precipitate out
• put filter paper into a funnel and into a conical flask
• pour contents of beaker into the funnel and wait for liquid to drip into flask
• swill put beaker with deionised water and tip into funnel
• rinse contents of filter paper with deionised water
• scrape insoluble salt onto fresh filter paper and leave to dry

Question 13

why should you use deionised water during the experiment to make an insoluble salt

Answer 13

to make sure that there are no other ions about

Question 14

why should you make sure that the contents dont go above the filter paper when pouring it into the funnel

Answer 14

so that some of the solid doesnt dribble down along the side

Question 15

why should you swill out the beaker with water and tip into the filter paper

Answer 15

to make sure you get all the precipitate from the beaker

Question 16

why should you rinse the contents of the filter paper with deionised water

Answer 16

to make sure that all of the soluble salt has been washed away

Question 17

where could you leave the insoluble salt to dry in

Answer 17

an oven or desiccator