metal hydroxides precipitate

Question 1

what solution added to metal hydroxides?

Answer 1

NaOH

Question 2

what must we do at start of test?

Answer 2

just a few drops of NaOH are added at first and very slowly

Question 3

why is it bad if we add NaOH in excess at start?

Answer 3

If it is added too quickly and the precipitate is soluble in excess, then you run the risk of missing the formation of the initial precipitate which dissolves as quickly as it forms if excess solution is added

Question 4

Al3+ evaluation

Answer 4

WHITE precipitate, DISSOLVES in excess NaOH to form a COLOURLESS solution

Question 5

Mg2+ evaluation

Answer 5

WHITE precipitate, Insoluble so remainsin excess NaOH

Question 6

Ca2+ evaluation

Answer 6

WHITE precipitate, INSOLUBLE so remains in excess NaOH

Question 7

Cu2+ evaluation

Answer 7

LIGHT BLUE precipitate, INSOLUBLE in excess NaOH

Question 8

Fe2+ evaluation

Answer 8

GREEN precipitate,INSOLUBLE in excess

Question 9

Fe3+ evaluation

Answer 9

RED-BROWN precipitate, INSOLUBLE in excess