acids and bases

Question 1

is a pH of 7 acidic, neutral or alkaline?

Answer 1

neutral

Question 2

is a pH of 3 acidic, neutral or alkaline?

Answer 2

acidic

Question 3

is a pH of 9 acidic, neutral or alkaline?

Answer 3

alkaline

Question 4

what is the scale of pH?

Answer 4

0-14

Question 5

what ions do acids form in water?

Answer 5

H+

Question 6

what ions do alkalis form in water?

Answer 6

OH-

Question 7

what is the difference between a base and an alkali?

Answer 7

an alkali is soluble in water, a base is not

Question 8

what does pH measure

Answer 8

the concentration of H+ (hydrogen) ions

Question 9

what colour does litmus paper turn in acidic, neutral and base solutions?

Answer 9

acidic - red
neutral - purple
alkaline - blue

Question 10

what colour does methyl orange turn in acidic, neutral and alkaline solutions?

Answer 10

acidic - red
neutral - yellow
alkaline - yellow

Question 11

what colour does phenolphthalein turn in acidic, neutral and alkaline solutions?

Answer 11

acidic - colourless
neutral - colourless
alkaline - pink

Question 12

what is the reaction between an acid and a base called?

Answer 12

neutralisation

Question 13

what does neutralisation produce?

Answer 13

a salt and water