Chapter 5 Acid, Base s And Salt

Question 1

How can u obtain salt from a simple sample sea water

Answer 1

Evaporation the water apply heart to the dish and cool it and crystallize it remains with dry salt

Question 2

What is the solution which gives a red brown ppt

Answer 2

Iron III

Question 3

How can you distinguish between a strong and weak acid

Answer 3

Strong acid dissociate completely while a weak acid dissociates partially

Question 4

How can u know if substance A was and acid or not

Answer 4

Buy using a litmus paper
Red or blue

Where red litmus paper when dipped in an acid remains red

Blue turns red when dipped in an acid

Question 5

Sodium chloride likely to have what ph

Answer 5

7

Question 6

Name a salt that can be obtained from a metal and a dilute acid

Answer 6

Zinc sulphate

Question 7

Element which has green crystals

Answer 7

Iron sulphate

Question 8

Sodium hydroxide can react with a certain acid oxide to produce a salt called sodium sulphate name the acid oxide used

Answer 8

Sulphuric acid

Question 9

What can you see when little copper II oxide warmed with dilute nitrate acid

Answer 9

Crystalline solids are formed in a solution

Question 10

Hydrochloric acid likely to have what ph

Answer 10

2

Question 11

What’s an acid

Answer 11

A substance which produces hydrogen ions as the only positively ions when dissolved in water

Question 12

Name a molecule with a colorless liquid

Answer 12

Water

Question 13

What is used to measure the acidity or alkalinity of a substance

Answer 13

Ph meter

Question 14

When copper II oxide reacts with dilute nitrite acid how does copper II OXIDE behave

Answer 14

It behaves as a base which neutralize an acid

Question 15

Which ion is responsible for acidity

Answer 15

Hydrogen

H+

Question 16

What solution has a green ppt

Answer 16

Iron II

Question 17

Acids have a sour taste what ion is responsible for this taste

Answer 17

Hydrogen H+

Question 18

A first aid kit manual suggest that vinegar should be used to treat wasp sting and baking powered for bee sting

What’s the chemical nature for wasp stings

Answer 18

The wasp stings are alkaline therefore an acid will act on the wasp to neutralize the wasp stings

Question 19

What is neutralization reaction

Answer 19

It’s a reaction in which a base react with an acid to form salt and water

Question 20

State an ion responsible for alkalinity of a solution

Answer 20

The hydroxide ion H-

Oxides ion

Question 21

Which solution has a white ppt

Answer 21

Chloride

Question 22

Why hydrogen chloride has no effect on a dry blue litmus paper

Answer 22

Because hydrogen chloride is a neutral salt

Question 23

If We had no baking powered in the house what can we use to treat bee stings

Answer 23

Toothpaste

Question 24

What happens when we mix a base and acid

Answer 24

Naturalization occur

Question 25

What’s common name for sodium hydrogen carbonate

Answer 25

Baking soda

Question 26

Small amount of baking soda was added effervescence occurred
Producing a gas name gas produced

Answer 26

Carbon dioxide

Question 27

What’s a salt

Answer 27

It is a compound formed when hydrogen ions in an acid are replaced by a metal ions

Question 28

What’s a normal salt

Answer 28

A salt which contains no replaceable hydrogen

Question 29

How can u obtain pure salt of iron II sulphate from its crystal solution

Answer 29

Heat solution gently to concentrate it

Filter colorless crystalline

And recrystallize them

Filter off excess liquid

Let crystal dry

Pure iron sulphate is formed

Question 30

Name the reactant that produce zinc chloride

Answer 30

Hydrochloric acid and zinc hydroxide

Question 31

When the oxide and hydrogen are equal then it’s said to be

Answer 31

Neutral

Question 32

How can you obtain zinc chloride crystals from the solution of water and zinc chloride

Answer 32

By putting it in evaporating dish and leave pure crystal called zinc chloride