Acids, bases and salts

Question 1

Are sodium salts soluble

Answer 1

Yes, all of them

Question 2

Are ammonium salts soluble

Answer 2

Yes, all of them

Question 3

Are potassium salts soluble

Answer 3

Yes, all of them

Question 4

Are common chlorides soluble?

Answer 4

Yes, apart from lead (II) and silver chloride

Question 5

Are common sulphates soluble?

Answer 5

Yes, apart from lead (II), calcium and barium sulphate

Question 6

Are most common carbonates insoluble?

Answer 6

Yes, apart from sodium, potassium, ammonium carbonate

Question 7

Are most common hydroxides insoluble?

Answer 7

Yes apart from sodium, potassium and ammonium hydroxide?

Question 8

Gas test for oxygen

Answer 8

Relights glowing splint

Question 9

Gas test for hydrogen

Answer 9

Sqeaky pop with lit splint

Question 10

Test for chlorine gas

Answer 10

Damp blue litmus turns red then bleaches white

Question 11

Test for ammonia

Answer 11

Turns damp red litmus blue

Question 12

Test for carbon dioxide

Answer 12

Turns limewater from clear to milky

Question 13

Test for sulphate gas

Answer 13

Turns potassium manganate from purple to colourless

Question 14

Flame test for Li+

Answer 14

Crimson flame

Question 15

Flame test for Na+

Answer 15

Yellow flame

Question 16

Flame test for K+

Answer 16

Lilac flame

Question 17

Flame test for Cu2+

Answer 17

Blue/Green flame

Question 18

Flame test for Ca2+

Answer 18

Brick red flame

Question 19

Flame test for Ba2+

Answer 19

Apple green flame

Question 20

What colour does acid turn phenolphthalein

Answer 20

colourless

Question 21

What colour does alkali turn phenolphthalein

Answer 21

Pink

Question 22

What colour does methyl orange turn

Answer 22

Red in acid

Yellow in neutral and colourless

Question 23

When do you use a titration

Answer 23

When it is a soluble salt

Question 24

Explain how to conduct a titration

Answer 24

Add a known volume of alkali to a conical flask from a pipette

Add a few drops of indicator e.g. phenolphthalein

Add measured volume of acid from a burette

Stop adding acid when it has changed colour

Repeat three times to receive concordant results

Question 25

How to react an insoluble salt with an acid

Answer 25

Add excess of the insoluble solid a little at a time while stirring glass rod to hot acid Filter to remove excess solid Evaporate resulting solution and leave in the sun to crystallise Dry crystals between filter papers

Question 26

How to make an insoluble salt

Answer 26

Made by mixing two soluble salts After mixing filter the solution to receive insoluble precipitate leave crystals to dry