NCEA 1 acids and bases

Which of these solutions is acidic?

• lemon juice

• baking powder

• oven cleaner

• pure water

Which solution will turn blue litmus red?

• pure water

• lemon juice

• hydrochloric acid

• sodium choride solution

Which universal indicator colour matches a pH of 2?

• red

• orange

• yellow

• green

• blue

Which universal indicator colour matches a pH of 6

• red

• orange

• yellow

• green

which pH number matches the universal indicator colour blue?

• 1

• 3

• 7

• 9

which gas is given out when a hydrogen carbonate reacts with acid?

• hydrogen

• oxygen

• nitrogen

• carbon dioxide

which gas is made when an acid reacts with a metal?

• hydrogen

• oxygen

• nitrogen

• carbon dioxide

A solution which has a greater concentration of H⁺ ions than OH^- ions could have a pH number of :-

• 1

• 7

• 8

• 14

A solution in which the concentration of H⁺ and OH^- ions is the same is called :-

• acidic

• neutral

• weakly basic

• strongly basic

the reaction H⁺ + OH^- ---------> H₂O is called

• acidification

• salt making

• neutralisation

• hydrogenation