Page 96 - Chemistry ICSE Class X

82 ICSE Chemistry – 10

Procedure: &ŽůůŽǁ ƚŚĞ ƐƚĞƉƐ ŐŝǀĞŶ ďĞůŽǁ͗
ƒ WƌĞƉĂƌĞ Ă ƐŽůƵƟŽŶ ŽĨ ůĞĂĚ ŶŝƚƌĂƚĞ ŝŶ ĚŝƐƟůůĞĚ ǁĂƚĞƌ͘
ƒ dĂŬĞ ĂďŽƵƚ ϱϬ ŵ> ŽĨ ƚŚŝƐ ƐŽůƵƟŽŶ ŝŶ Ă ďĞĂŬĞƌ͘
ƒ ĚĚ ĚŝůƵƚĞ ŚLJĚƌŽĐŚůŽƌŝĐ ĂĐŝĚ ΀, ů;aqͿ΁ ĚƌŽƉǁŝƐĞ ǁŝƚŚ ĐŽŶƐƚĂŶƚ ƐƟƌƌŝŶŐ͘
ƒ >Ğƚ ƚŚĞ ǁŚŝƚĞ ƉƌĞĐŝƉŝƚĂƚĞ ĨŽƌŵĞĚ ƐĞƩůĞ ĚŽǁŶ͘
ƒ &ŝůƚĞƌ ƚŚĞ ƉƌĞĐŝƉŝƚĂƚĞ ŽŶ Ă ĮůƚĞƌ ƉĂƉĞƌ ĂŶĚ ǁĂƐŚ ŝƚ ǁŝƚŚ ĚŝƐƟůůĞĚ ǁĂƚĞƌ͘
ƒ dƌĂŶƐĨĞƌ ƚŚĞ ǁŚŝƚĞ ƉƌĞĐŝƉŝƚĂƚĞ ŝŶƚŽ Ă ďŽŝůŝŶŐ ƚƵďĞ ĂŶĚ ĂĚĚ ŵŝŶŝŵƵŵ ƋƵĂŶƟƚLJ ŽĨ ĚŝƐƟůůĞĚ ǁĂƚĞƌ ƚŽ ŵĂŬĞ Ă ƐƵƐƉĞŶƐŝŽŶ͘
ƒ ,ĞĂƚ ƚŚĞ ďŽŝůŝŶŐ ƚƵďĞ ŽŶ Ă ůŽǁ ŇĂŵĞ ƵŶƟů ƚŚĞ ĐƌLJƐƚĂůƐ ŽĨ ůĞĂĚ ĐŚůŽƌŝĚĞ ĚŝƐƐŽůǀĞ ĐŽŵƉůĞƚĞůLJ͘
ƒ ůůŽǁ ƚŚĞ ƐŽůƵƟŽŶ ƚŽ ĐŽŽů͘ EĞĞĚůĞͲƐŚĂƉĞĚ ĐƌLJƐƚĂůƐ ŽĨ ƉƵƌĞ ůĞĂĚ ĐŚůŽƌŝĚĞ ĂƌĞ ĨŽƌŵĞĚ͘
ƒ &ŝůƚĞƌ ƚŚĞ ĐƌLJƐƚĂůƐ ĂŶĚ ĚƌLJ ƚŚĞŵ ďĞƚǁĞĞŶ ƚŚĞ ĨŽůĚƐ ŽĨ ĮůƚĞƌ ƉĂƉĞƌƐ͘
ƒ ^ƚŽƌĞ ƚŚĞ ĐƌLJƐƚĂůƐ ŽĨ ůĞĂĚ ĐŚůŽƌŝĚĞ ŝŶ Ă ŐůĂƐƐ ďŽƩůĞ͘

How is anhydrous ferric chloride prepared

Ferric chloride (FeCl ) is a normal salt of the base ferric hydroxide [Fe(OH) ] and the acid hydrochloric acid,
3
3
(HCl).
ACTIVITY 3 Aim: To prepare anhydrous ferric chloride ϯ ů ;gͿ o ' Ϯ & Ğ ů 3 ;sͿ
Principle: ŶŚLJĚƌŽƵƐ ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ ĐĂŶ ďĞ ƉƌĞƉĂƌĞĚ ďLJ ĚŝƌĞĐƚ ĐŽŵďŝŶĂƟŽŶ ŽĨ ŝƌŽŶ ĂŶĚ ĐŚůŽƌŝŶĞ͘
Reagents required: /ƌŽŶ ĮůŝŶŐƐ ĂŶĚ ĐŚůŽƌŝŶĞ ŐĂƐ
Ϯ&Ğ;sͿ
ZĞĂĐƟŽŶ͗
н
2

ŝƌŽŶ ;ŚŽƚͿ

ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ ;ĂŶŚLJĚƌŽƵƐͿ
ĐŚůŽƌŝŶĞ

dŚĞ ƌĞĂĐƟŽŶ ŝƐ ĞdžŽƚŚĞƌŵŝĐ͘ ^Ž͕ ŚĞĂƟŶŐ ŝƐ ƐƚŽƉƉĞĚ ĂŌĞƌ ƚŚĞ ƌĞĂĐƟŽŶ ƐƚĂƌƚ ƚĂŬŝŶŐ ƉůĂĐĞ͘
Apparatus: dŚĞ ĨŽůůŽǁŝŶŐ ĚŝĂŐƌĂŵ ƐŚŽǁƐ ƚŚĞ ĞdžƉĞƌŝŵĞŶƚĂů ƐĞƚͲƵƉ ĨŽƌ ƚŚĞ ƉƌĞƉĂƌĂƟŽŶ ŽĨ ĂŶŚLJĚƌŽƵƐ ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ͗

Preparation of anhydrous ferric chloride
Procedure: &ŽůůŽǁ ƚŚĞ ƐƚĞƉƐ ŐŝǀĞŶ ďĞůŽǁ͗
ƒ ^Ğƚ ƚŚĞ ĂƉƉĂƌĂƚƵƐ ĂƐ ƐŚŽǁŶ ĂďŽǀĞ͘
ƒ WůĂĐĞ Ă ƐŵĂůů ƋƵĂŶƟƚLJ ŽĨ ŝƌŽŶ ;ƉŽǁĚĞƌ Žƌ ĮůŝŶŐƐͿ ŝŶ ƚŚĞ ĐŽŵďƵƐƟŽŶ ƚƵďĞ ĂŶĚ ŚĞĂƚ ŝƚ͘
ƒ WĂƐƐ ĚƌLJ ĐŚůŽƌŝŶĞ ŐĂƐ ŽǀĞƌ ŚĞĂƚĞĚ ŝƌŽŶ͘
ƒ dŚĞ ǀĂƉŽƵƌ ŽĨ ƚŚĞ ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ ĨŽƌŵĞĚ ŐĞƚ ĐŽŶĚĞŶƐĞĚ ŝŶ ƚŚĞ ƌĞĐĞŝǀĞƌ ďŽƩůĞ ĂƐ ďƌŽǁŶ ŇĂŬĞƐ͘
ƒ dŚĞ ĞdžĐĞƐƐ ĐŚůŽƌŝŶĞ ƐŚŽƵůĚ ďĞ ĚŝƐƉŽƐĞĚ Žī ĐĂƌĞĨƵůůLJ͘

ŶŚLJĚƌŽƵƐ ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ ĐĂŶŶŽƚ How is zinc sulphate prepared
ďĞ ƉƌĞƉĂƌĞĚ ďLJ ŚĞĂƟŶŐ ŚLJĚƌĂƚĞĚ Zinc sulphate (ZnSO ) is a normal salt of the base zinc hydroxide [Zn(OH) ]
4
ĨĞƌƌŝĐ ĐŚůŽƌŝĚĞ͕ ;&Ğ ů ͘ ϲ, KͿ͘ dŚŝƐ ŝƐ and acid sulphuric acid (H SO ). 2
2
3
ďĞĐĂƵƐĞ ŽŶ ŚĞĂƟŶŐ͕ ƚŚĞ ŚLJĚƌĂƚĞĚ ƐĂůƚ 2 4
ƵŶĚĞƌŐŽĞƐ ŚLJĚƌŽůLJƐŝƐ ĂŶĚ ƉƌŽĚƵĐĞƐ Zinc sulphate when crystallised from its aqueous solution forms
.
&Ğ O ͕ , ů ĂŶĚ , K͘ crystals of zinc sulphate heptahydrate (ZnSO 7H O).
2 3
2
ŚĞĂƚ 4 2
Ϯ&Ğ ů ͘ ϲ, K;sͿ o &Ğ O ;sͿ
3
2 3
2
н ϲ , ů ; gͿ
н ϵ , 2 K;gͿ