acids and bases 1.5

Question 1

how do you measure the pH

Answer 1

universal indicator and pH paper

Question 2

what colour are acids on the pH scale

Answer 2

red-orange-yellow

Question 3

what colour are alkalis on the pH scale

Answer 3

dark green-blue-purple-pink

Question 4

what colour and number are neutral solutions on the pH scale

Answer 4

7 and green

Question 5

what do acidic solutions contain more of

Answer 5

H+ ions that OH- ions

Question 6

what do alkaline solutions contain more of

Answer 6

OH- ions than H+

Question 7

neutral solutions contain equal amounts of what

Answer 7

H+ ions and OH- ions

Question 8

what is neutralisation

Answer 8

when an acid and base react to give a neural solution

Question 9

what happens when you neutralise an acid

Answer 9

the pH increases to 7

Question 10

what happens when you neutralise an alkali

Answer 10

the pH decreases to 7

Question 11

what are the products of an acid + metal hydroxide

Answer 11

salt + water

Question 12

what are the products of an acid + metal oxide

Answer 12

salt + water

Question 13

what are the products of an acid + metal carbonate

Answer 13

salt + water + carbon dioxide

Question 14

why do we use pipettes

Answer 14

to accurately measure the sample

Question 15

when are acids formed

Answer 15

when soluble non-metal oxides dissolve in water and increase the H+ ion concentration

Question 16

when are alkalis formed

Answer 16

when soluble metal oxides dissolve in water and increase OH- ion concentration

Question 17

name 3 bases used to neutralise an acid

Answer 17

metal hydroxides, metal oxides, metal carbonates

Question 18

what are spectator ions

Answer 18

ions that are left unchanged by the reaction