C3.3.2 - Smelly problem (Litmus, UI and Neutralisation)

Question 1

A weak acid is pH ___ to ____

Answer 1

4 to 6

Question 2

A solution turns blue litmus paper red and red litmus paper stays red it is an…

Answer 2

acid

Question 3

If an acid is added to an alkali the pH will go _____

Answer 3

down

Question 4

pH 8-14 are all…

Answer 4

alkali

Question 5

A solution turns red litmus paper blue and blue litmus paper stays blue it is an…

Answer 5

alkali

Question 6

A strong acid is pH ___ to ___

Answer 6

1-3

Question 7

the colour chart used to tell us what the colour of universal indicator mean is called the…

Answer 7

pH scale

Question 8

HIGHER: How do we name a salt that is produced in a neutralisation reaction.

e.g.

ethanoic acid + sodium hydroxide –> _______ + water

Answer 8

ethanoic acid + sodium hydroxide –> ______ + water

Salt name is made from 2 words.

First word is the metal.

Second word is part of the acid name with ate at the end.

e.g.

Sodium Ethanoate

Question 9

The reaction between an acid and an alkali is called a…

Answer 9

neutralisation reaction

Question 10

pH 7 is…

Answer 10

neutral

Question 11

What is the equation for reacting an acid with an alkali?

Answer 11

Acid + Alkali –> Salt + Water

Question 12

A strong alkali is pH ____ to ___

Answer 12

11-14

Question 13

Red litmus paper stays red and blue litmus paper stays blue. The solution is …

Answer 13

neutral

Question 14

Why is universal indicator more useful than litmus paper?

Answer 14

It tells us the strength of an acid or alkali.

Question 15

pH 1-6 are…

Answer 15

Acids

Question 16

If an alkali is added to an acid the pH will go _____

Answer 16

up

Question 17

Strong acids an alkalis can chemically burn the skin. We say that they are…

Answer 17

corrosive

Question 18

Salts always end in which 3 letters?

Answer 18

• ate
  e. g. copper sulfate

Question 19

A weak alkali is pH ___ to ____

Answer 19

8 to 10

Question 20

Name 2 indicators that can be used to identify acids and alkalis.

Answer 20

Litmus paper

Universal Indicator

Question 21

How can an acid spill be disposed of?

Answer 21

Add an alkali to neutralise it into water and a salt.

Put sand on it and clear the sand.

Have a chemical disposal company deal with it.