Acids Bases And Salts

Question 1

Colour change of phenolphthalein

Answer 1

Acid- colourless
Neutral- colourless
Alkali- pink

Question 2

Colour change of methyl orange

Answer 2

Acid-red
Neutral-orange
Alkali- yellow

Question 3

If a substances pH is 0-2 it is described as

Answer 3

A strong acid

Question 4

If a substance has a 3-6 pH it is described as

Answer 4

Weak acid

Question 5

A substance which has a pH of 8-11

Answer 5

Weak acid

Question 6

A substance with a pH of 12-14 is described as

Answer 6

Strong alkali

Question 7

Which acid will ionise completely in water

Answer 7

A strong acid

Question 8

Which acid will partially ionise in water

Answer 8

A weak acid

Question 9

Define base

Answer 9

A base is a substance that will react with acid producing a salt and water

Question 10

What is an alkali

Answer 10

A soluble base

Question 11

Which ions does acid produce

Answer 11

H+

Question 12

Which ions does alkali produce

Answer 12

OH-

Question 13

What does the concentration of an acid or alkali mean

Answer 13

Concentration is the measurement of acid/alkali molecules dissolved in 1dmcubed of water and is measured as mol/dm3.

Question 14

How does the temperature change in neutralisation

Answer 14

Neutralisation is an exothermic reaction. This means it gives off heat

Question 15

General equation for acid + metal

Answer 15

Acid + metal —> salt + hydrogen

Question 16

General equation for acid + base

Answer 16

Acid + base —-> salt + water

Question 17

General equation for acid + carbonate/ hydrogencarbonate

Answer 17

Acid + carbonate —-> salt + water + carbon dioxide