Question

Identify the cation from the following coloured precipitate when metal salts
reacts with Sodium Hydroxide
a. reddish brown in colour
b. pale blue in colour
c. dirty green in colour

Answer 1

Answer:

(i) Fe

3+

with NaOH gives reddish brown precipitate of Fe(OH)

3

.

(ii) Pb

+2

with NH

4

OH gives gelatinous white precipitate of Pb(OH)

2

.

(iii) Ca

+2

with NaOH gives white precipitate of Ca(OH)

2

which dissolves in excess.