Page 120 - Chemistry ICSE Class X

106 ICSE Chemistry – 10
ƒ Basic character of lead oxide

PbO(s) + 2HCl(aq) o PbCl (s) + H O(l)
2
2
lead oxide hydrochloric acid lead chloride water
(base) (acid) (salt)
ƒ Acidic character of lead oxide
PbO(s) + 2NaOH(aq) o Na PbO (aq) + H O(l)
2
2
2
lead oxide sodium hydroxide sodium plumbite water
(base) (base) (salt)
PbO + 2KOH o K PbO 2 + H O
2
2
lead oxide potassium hydroxide potassium plumbite water
Amphoteric character of hydroxides of aluminium, zinc
and lead

ƒ Basic character of aluminium hydroxide
2Al(OH) (s) + 3H SO (aq) o Al (SO ) (aq) + 6H O(l)
4 3
2
4
2
3
2
aluminium hydroxide dil. sulphuric acid aluminium sulphate water
,LJĚƌŽdžŝĚĞƐ ŽĨ njŝŶĐ͕ ĂůƵŵŝŶŝƵŵ ĂŶĚ (base) (acid) (salt)
ůĞĂĚ ĂƌĞ ĂŵƉŚŽƚĞƌŝĐ ďĞĐĂƵƐĞ ƚŚĞLJ
ƌĞĂĐƚ ǁŝƚŚ ďŽƚŚ ĂĐŝĚƐ ĂŶĚ ĂůŬĂůŝƐ ƒ Acidic character of aluminium hydroxide
ƐŚŽǁŝŶŐ ƚŚĞŝƌ ďĂƐŝĐ ĂƐ ǁĞůů ĂƐ ĂĐŝĚŝĐ Al(OH) (s) + NaOH(aq) o NaAlO (aq) + 2H O(l)
ŶĂƚƵƌĞ͘ 3 2 2
acid base (alkali) salt water
Al(OH) 3 + KOH o K[Al(OH) ]
4
acid base (alkali) salt
ƒ Basic character of zinc hydroxide
Zn(OH) 2 + H SO (aq) o ZnSO (aq) + 2H O(l)
2
4
2
4
zinc hydroxide dil. sulphuric acid zinc sulphate water
(base) (acid) (salt)
ƒ Acidic character of zinc hydroxide
Zn(OH) 2 + 2NaOH(aq) o Na ZnO (aq) + 2H O(l)
2
2
2
zinc hydroxide sodium hydroxide sodium zincate water
(acid) (base) (salt)
Zn(OH) 2 + 2KOH U K [Zn(OH) ]
2
4
zinc hydroxide potassium hydroxide
ƒ Basic character of lead hydroxide
Pb(OH) (s) + 2HCl(aq) o PbCl (s) + 2H O(l)
2
2
2
lead hydroxide hydrochloric acid lead chloride water
(base) (acid) (salt)
ƒ Acidic character of lead hydroxide
Pb(OH) (s) + 2NaOH(aq) o Na PbO (aq) + 2H O(l)
2
2
2
2
lead hydroxide sodium hydroxide sodium plumbite water
(acid) (base) (salt)
Pb(OH) 2 + 2KOH o K [Pb(OH) ]
2
4
lead hydroxide potassium hydroxide