Past Papers About Acid And Alkali

Question 1

An acid can be reacted with a base in a titration experiment?

(i)State the name of the type of the reaction when an acid react with a base?

Answer 1

Neutralisation

Question 2

General equation for the reactions of an acid and a base is?

Answer 2

Acid+base->Salt + Water

Question 3

Copper carbonated is added for the acid in the flask

The cooler carbonates is added one spatula measure at the time until the reaction is finnished

State two observation that would show the reactions has finished?

Answer 3

1) add until y oh see that the carbonates is still at the bottom of the chonical flask

2)No more bubbles/frizz

Question 4

What is the meaning of the hazard symbol?

Answer 4

Health hazard

Question 5

Name a piece of equipment which could measure out 50.0cm of dilute hydrochloric acid?

Answer 5

burrette

Question 6

Give one precaution the student should take when using a barium hydroxide?

Answer 6

Safety goggles

Question 7

Describe how the pH of the mixture is determined when a drop is place don a universal indicator paper

Answer 7

When pure water is dropped into a solution the indicator stays green if it’s neutral(7) this determines the strength of the substance if it’s acidic or alkalinity

Question 8

Explain why litmus paper would not be suitable to use in this experiment?

Answer 8

• doesn’t mention the strength of the substance
• only sees red and blue

Question 9

Sodium hydroxide solution was added to a solution of copper Sulfate

A precipitate of copper hydroxide and solution of sodium Sulfate is added

State what would be seen in the reaction?

Answer 9

Will go colourless

Question 10

Describe the balanced equation for the reduction by adding a number of NaoH

Answer 10

2NaOH

Question 11

Describe the pure fry sample or the precipitation of copper hydroxide from the reaction mixture?

Answer 11

1)Filter
2)Washed with pure substance
3)Warm place

Question 12

State what could be used to measure the pH of a solution?

Answer 12

pH meters

Question 13

Sodium choloride is neutral
Gives the pH of this solution

Answer 13

7

Question 14

What is the chemical test to show the gas is carbon dioxide?

Answer 14

(A) bubbles the gas though limewater+turns cloudy

Question 15

State what could be added to the sulftic acid to show when it has been neutralised by ammonia solution

Answer 15

Any indication
(NOT UNIVERSAL)

Question 16

Q9

Answer 16

Cl2+H20-> Hcl

Question 17

Q8

Answer 17

Burrette

Question 18

Gives a safety precaution that could be taken during experiments?

Answer 18

Safety googles

Question 19

Give an improvement to step 4 that would produce an accurate results

Answer 19

Measure scale

Question 20

Q10 (iii)

Answer 20

B) from 1 to 12

Question 21

If some methyl or range indicator is added to the acid in step 2 the mixture changes colour during the experiment.state the colour change

Answer 21

Start - red
End - yellow

Question 22

Describe what you would see when some copper carbonates powder is added to the beaker of dilute sulfric acid

Answer 22

1) sees bubbling
2)powder dissolve

Question 23

Give the formula of the ions in diffuse 6 that causes the Hydrogen chloride solution to be acidic

Answer 23

H+

Question 24

What is the formula of a cations?

Answer 24

Na+

Question 25

Place the metals of reactivity to less reactive

Answer 25

Most reactive : magnesium
Ions
Less reactive : Silver

Question 26

When diblute hydrochloride acid is added to potassium carbonate a gas is evolved

Describe the test for the gas

Answer 26

Carbonate dioxide put acid and carbonate in a tube and limewater then wait until cloudy

Question 27

Q12) (ii)

Answer 27

C(put a lighted split at the open end of the test)

Question 28

State the observation made in the test that shows that the gas is hydrogen

Answer 28

Heard a squeaky pop

Question 29

Solution of doubles salts can react together to form an insoluble form an insoluble salt

Answer 29

Neutrasliation