Page 88 - Chemistry - XII

ZnCl +2NaOH Zn OH +2NaCl
2 2
Whitte ppt.

Zn OH +2NaOH Na ZnO+ 2H O
2 2 2 2
Soluble

KFeCN
6
4

2ZnCl+ KFeCN Zn FeCN + 4KCl

2 4 6 2 6
Bluish white ppt.
Mn +H S MnS +2H +
+2
2
Buff or flesh

coloured ppt.

MnS+ 2HCl → MnCl +H S
2 2

MnCl +2NaOH Mn OH +2NaCl
2 2
Whiite ppt.

Mn OH +O MnOOH
2 2
(From (Brown

bromine water) ppt.)

OH O

NiCl +2NH OH+2CH C=N OH CH C= N N =C CH +2NH Cl+2HO

2 4 3 3 3 4 2
N Ni

CH C=N OH CH C= N N =C CH

3 3 3

O OH
S carlet red ppt.

Co +H S CoS +2H +
+2
2
Black ppt.

CoS+6HCl+2HNO → 3CoCl+ 2NO+3S+4HO

3 2 2
Aqua regia

CoCl +7KNO +2CH COOH KCoNO + 2KCl+2CH COOK +NO+ HO
3
2 6
2 2 3 3 2
Yeellow ppt.