salt preparation

Question 1

what do acids form in:

• water
• aqueous solution

Answer 1

• acidic solutions
• hydrogen ions

Question 2

Do acidic solution have a Ph of more or less than 7?

Answer 2

less

Question 3

What do alkalis form in

• water
• aqueous solution

Answer 3

• alkaline solutions
• hydroxide ions

Question 4

Define an acid

Answer 4

Produces more hydrogen ions than hydroxide ions when dissolved in water

Question 5

Define an alkali

Answer 5

Produces more hydroxide ions than hydrogen ions when dissolved in water.

Question 6

Define a neutral solution

Answer 6

• Neither acidic or alkaline
• PH value of 7

Question 7

How does red litmus paper react in contact with:

-acidic

-neutral

-alkaline

Answer 7

• stays red
• stays red
• turns blue

Question 8

How does blue litmus paper react in contact with:

-acidic

-neutral

-alkaline

Answer 8

• turns red
• stays blue
• stays blue

Question 9

What is a base?

Answer 9

Reacts with an acid to neutralise it and produce a salt and water.

Question 10

Two examples of Bases

Answer 10

• Metal oxides
• metal hydroxide

Question 11

All bases which are soluble in water are called?

Answer 11

Alkalis

Question 12

Are all alkalis or acids bases?

Answer 12

Alkalis

Question 13

What is a neutralisation reaction?

Answer 13

• It is a reaction between an acid and a base.
• It forms a salt plus water

Question 14

What happens in an acid - alkali neutralisation reaction?

Answer 14

the hydrogen ions react with the hydroxide ions.

Question 15

How can the change in PH during a neutralisation reaction be measured?

Answer 15

Using a PH probe.

Question 16

What happens in acid reactions?

Answer 16

The hydrogen ions are replaced by metal ions.