chemical reagents used to remove phosphine frome hydrogen
Answers
Explanation:
The impurities can be removed from hydrogen by passing it through
1. Silver nitrate solution to remove arsine and phosphine.
AsH
3
+6AgNO
3
→Ag
3
As+3AgNO
3
+3HNO
3
PH
3
+6AgNO
3
→Ag
3
P+3AgNO
3
+3HNO
3
2. Lead nitrate solution to remove hydrogen sulphide.
Pb(NO
3
)
2
+H
2
S→PbS+2HNO
3
Caustic potash solution to remove sulphur dioxide, carbon dioxide and oxides of nitrogen.
SO
2
+2KOH→K
2
SO
3
+H
2
O
CO
2
+2KOH→K
2
CO
3
+H
2
O
2NO
2
+2KOH→KNO
2
+KNO
3
+H
2
O
4. A drying agent used to dry the gas. Common drying agents such as fused calcium chloride, caustic potash stick and phosphorus pentoxide remove water vapour.
So, the gas is purified and dried and then collected over mercury because mercury does not react with it.