Soluble and Insoluble salts (Paper 1)

Question 1

Is sodium soluble or insoluble?

Answer 1

Soluble

Question 2

Is potassium soluble or insoluble?

Answer 2

Soluble

Question 3

Is ammonium soluble or insoluble?

Answer 3

Soluble

Question 4

Are nitrates soluble or insoluble?

Answer 4

Soluble

Question 5

Are common chlorides soluble or insoluble?

Answer 5

Soluble (except silver chloride and lead chloride)

Question 6

Are common sulfates soluble or insoluble?

Answer 6

Soluble (except lead, barium and calcium sulfate)

Question 7

Are common carbonates and hydroxides soluble or insoluble?

Answer 7

Insoluble (except for sodium, potassium and ammonium ones)

Question 8

How do you make Insoluble salts?

Answer 8

-You can use a precipitaion reaction
-Add 1 spatula of lead nitrate to a test tube and add water to dissolve it
-In another test tube add 1 spatula of sodium chloride
-Tip the two solutions into a beaker and stir until there is a precipitate
-Then filter it and leave it to dry leaving lead chloride

Question 9

How do you make Soluble salts with an Acid and Insoluble Base?

Answer 9

-You can use a neutralisation reaction
-Heat the acid in a water bath to speed up the reaction
-Add the base to the acid to produce the soluble salt and water
-You know it’s in excess when the excess solid sinks to the bottom of the flask
-Filter it, heat to evaporate any water and leave to crystalise

Question 10

How do you make Soluble salts with Acid/Alkali reactions?

Answer 10

-You can use a neutralisation reaction
-Measure out an amount of acid into a conical flask with a pipette and add some indicator
-Slowly add the alkali to the acid using a burette until you see the colour change
-Repeat this process without the indicator so it’s not contaminated
-Slowly evaporate off some of the water and leave it to crystallise