Page 121 - Chemistry ICSE Class X

Analytical Chemistry 107

ASSIGNMENT 2

Action of alkalis on certain metals and metal oxides

ϭ͘ tƌŝƚĞ ƚŚĞ ŶĂŵĞ ĂŶĚ ĨŽƌŵƵůĂĞ ŽĨ
;ĂͿ tŚŝƚĞ ŵĞƚĂů ŚLJĚƌŽdžŝĚĞƐ ;ďͿ ŽůŽƵƌĞĚ ŵĞƚĂů ŚLJĚƌŽdžŝĚĞƐ
Ϯ͘ tŚŝĐŚ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ ŵĞƚĂů ŚLJĚƌŽdžŝĚĞƐ ĂƌĞ ƐŽůƵďůĞ ŝŶ ĞdžĐĞƐƐ ŽĨ ƐŽĚŝƵŵ ŚLJĚƌŽdžŝĚĞ͍
DŐ;K,Ϳ ͕ &Ğ;K,Ϳ ͕ &Ğ;K,Ϳ ͕ Ƶ;K,Ϳ ͕ Ŷ;K,Ϳ ͕ Wď;K,Ϳ ͕ ů;K,Ϳ ĂŶĚ Ă;K,Ϳ
Ϯ Ϯ ϯ Ϯ Ϯ Ϯ ϯ Ϯ
ϯ͘ tŚŝĐŚ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ ŵĞƚĂů ŚLJĚƌŽdžŝĚĞƐ ĂƌĞ ŝŶƐŽůƵďůĞ͕ ƐƉĂƌŝŶŐůLJ ƐŽůƵďůĞ Žƌ ƐŽůƵďůĞ ŝŶ ĞdžĐĞƐƐ ŽĨ ĂŵŵŽŶŝƵŵ ŚLJĚƌŽdžŝĚĞ͍
DŐ;K,Ϳ ͕ &Ğ;K,Ϳ ͕ &Ğ;K,Ϳ ͕ Ƶ;K,Ϳ ͕ Ŷ;K,Ϳ ͕ Wď;K,Ϳ ͕ ů;K,Ϳ ĂŶĚ Ă;K,Ϳ
Ϯ Ϯ ϯ Ϯ Ϯ Ϯ ϯ Ϯ
ϰ͘ EĂŵĞ ƚŚĞ ĐŚůŽƌŝĚĞ ŽĨ Ă ŵĞƚĂů ǁŚŝĐŚ ŝƐ ƐŽůƵďůĞ ŝŶ ĞdžĐĞƐƐ ŽĨ ĂŵŵŽŶŝƵŵ ŚLJĚƌŽdžŝĚĞ͘
ϱ ͘ E Ă ŵ Ğ
;ĂͿ ŵĞƚĂůůŝĐ ŽdžŝĚĞ ƐŽůƵďůĞ ŝŶ ĞdžĐĞƐƐ ŽĨ ƐŽĚŝƵŵ ŚLJĚƌŽdžŝĚĞ ƐŽůƵƟŽŶ͘
;ďͿ dǁŽ ďĂƐĞƐ ǁŚŝĐŚ ĂƌĞ ŶŽƚ ĂůŬĂůŝƐ ďƵƚ ĚŝƐƐŽůǀĞ ŝŶ ƐƚƌŽŶŐ ĂůŬĂůŝƐ͘
;ĐͿ ĐŽůŽƵƌĞĚ ŵĞƚĂů ŽdžŝĚĞ ƚŚĂƚ ĚŝƐƐŽůǀĞƐ ŝŶ ĂůŬĂůŝƐ ƚŽ ŐŝǀĞ Ă ĐŽůŽƵƌůĞƐƐ ƐŽůƵƟŽŶ͘
ϲ͘ tŚĂƚ ĂƌĞ ĂŵƉŚŽƚĞƌŝĐ ŽdžŝĚĞƐ͍ :ƵƐƟĨLJ ƚŚĞ ďĞŚĂǀŝŽƵƌ ŽĨ ƐƵĐŚ ŽdžŝĚĞ ďLJ ŐŝǀŝŶŐ ƐƵŝƚĂďůĞ ƌĞĂĐƟŽŶƐ͘
ϳ͘ ŽŵƉůĞƚĞ ƚŚĞ ĨŽůůŽǁŝŶŐ ĐŚĞŵŝĐĂů ĞƋƵĂƟŽŶƐ͗
;ĂͿ Wď;sͿ н EĂK,;aqͿ o ___________ н ___________
ŚŽƚ ĂŶĚ ĐŽŶĐ͘
ďŽŝůŝŶŐ
;ďͿ ___________ н EĂK,;aqͿ н ___________ o E Ă ů K ;aqͿ н ___________
Ϯ
; diluteͿ
;ĐͿ Ŷ;K,Ϳ Ϯ н ___________ o E Ă Ϯ ŶK ;aqͿ н ___________
Ϯ

Let us Answer Some More Questions

1. Write the balanced chemical equations for the following reactions:
(a) When sodium hydroxide is added to iron(III) chloride solution.

(b) When zinc is reacted with hot and concentrated sodium hydroxide.
2+
2+
2. How will you distinguish between Zn and Pb using ammonium hydroxide solution?
3. (a) How can you distinguish between iron(II) sulphate solution and iron(III) sulphate solution by using sodium
hydroxide?
(b) Write the corresponding chemical equation.
4. Write the observations and balanced chemical equations for the following:
(a) Sodium hydroxide is added dropwise until its excess to a solution of zinc sulphate.
D #OOQPKWO J[FTQZKFG KU CFFGF ſTUV FTQRYKUG CPF VJGP KP GZEGUU VQ C UQNWVKQP QH EQRRGT UWNRJCVG

5. Distinguish by adding
(a) Sodium hydroxide solution and (b) Ammonium hydroxide solution
(i) Calcium salt and Lead salt
(ii) Lead salt and Zinc salt
(iii) Copper salt and Ferrous salt
(iv) Fe(II) salt and Fe(III) salt.