chemical analysis - metal hydroxide precipitate

Question 1

what happens if you add sodium hydroxide to a solution of calcium ions

Answer 1

a white precipitate is formed

Question 2

what happens if you add sodium hydroxide to a solution of magnesium ions

Answer 2

a white precipitate is formed

Question 3

what happens if you add sodium hydroxide to a solution of aluminum ions

Answer 3

a white precipitate is formed

Question 4

why is this a problem

Answer 4

we can’t disguinish between these tests as the result is all the same

Question 5

what happens if we add excess sodium hydroxide solution to the aluminum

Answer 5

the precipitate redissolves

Question 6

what happens when copper 2 ions react with sodium hydroxide

Answer 6

blue precipitate is formed

Question 6

how could we work out which one is calcium

Answer 6

flame tests

Question 7

what happens when iron 2 ions react with sodium hydroxide

Answer 7

green precipitate is formed

Question 8

what happens when iron 3 ions react with sodium hydroxide

Answer 8

brown precipitate is formed