Page 88 - Chemistry ICSE Class X

74 Aim: To test the acidity, neutrality and alkalinity by using (i) a pH paper (ii) the universal indicator ICSE Chemistry – 10

ACTIVITY 1 Apparatus required: ƌŽƉƉĞƌƐ͕ ƚĞƐƚ ƚƵďĞƐ͕ ƚĞƐƚ ƚƵďĞ ƐƚĂŶĚƐ͕ ǁŚŝƚĞ ŐůĂnjĞĚ ƟůĞ

Materials required: Ɖ, ƉĂƉĞƌ͕ hŶŝǀĞƌƐĂů ŝŶĚŝĐĂƚŽƌ
Procedure: &ŽůůŽǁ ƚŚĞ ƐƚĞƉƐ ŐŝǀĞŶ ďĞůŽǁ͗
By using pH paper
ƒ dĂŬĞ ϭ ŵ> ŽĨ ĞĂĐŚ ƐŽůƵƟŽŶͬƐĂŵƉůĞ ŝŶ Ă ƐĞƉĂƌĂƚĞ ƚĞƐƚ ƚƵďĞ͘
ƒ >ĂďĞů ƚŚĞ ƚĞƐƚ ƚƵďĞƐ ĂƐ ϭ͕ Ϯ͕ ϯ ĞƚĐ͕͘ ŝŶ ŽƌĚĞƌ͕ ĂŶĚ ƉůĂĐĞ ƚŚĞŵ ŽŶ ƚĞƐƚ ƚƵďĞ ƐƚĂŶĚ͘
ƒ dĂŬĞ ŽƵƚ Ă ƐƚƌŝƉ ŽĨ Ɖ, ƉĂƉĞƌ ;ĂůƐŽ ĐĂůůĞĚ test stripͿ ĂŶĚ ĐƵƚ ŝŶƚŽ ƐŵĂůů ƉŝĞĐĞƐ͘ WůĂĐĞ ƚŚĞƐĞ ƉŝĞĐĞƐ ŽŶ Ă ĐůĞĂŶ ĚƌLJ ǁŚŝƚĞ
ŐůĂnjĞĚ ƟůĞ͘
ƒ dĂŬĞ ŽƵƚ Ă ƐŵĂůů ƋƵĂŶƟƚLJ ŽĨ ƐŽůƵƟŽŶ ĨƌŽŵ ƚĞƐƚ ƚƵďĞ ϭ ǁŝƚŚ ƚŚĞ ŚĞůƉ ŽĨ Ă ĐůĞĂŶ ĚƌŽƉƉĞƌ ĂŶĚ ƉůĂĐĞ Ă ĚƌŽƉ ŽĨ ŝƚ ŽŶ Ă
ƉŝĞĐĞ ŽĨ ƚŚĞ Ɖ, ƉĂƉĞƌ͘
ƒ KďƐĞƌǀĞ ƚŚĞ ĐŽůŽƵƌ ĚĞǀĞůŽƉĞĚ ŽŶ ƚŚĞ ƉŝĞĐĞ ŽĨ Ɖ, ƉĂƉĞƌ͘
ƒ ŽŵƉĂƌĞ ƚŚĞ ĐŽůŽƵƌ ĚĞǀĞůŽƉĞĚ ŽŶ ƚŚĞ Ɖ, ƉĂƉĞƌ ǁŝƚŚ ƚŚĞ ĐŽůŽƵƌ ŐŝǀĞŶ ŽŶ ƚŚĞ ĐŚĂƌƚ ƐŚŽǁŶ ŽŶ ƚŚĞ Ɖ, ƉĂƉĞƌ ŬůĞƚ͘
ƒ ZĞĐŽƌĚ ƚŚĞ ŵĂƚĐŚŝŶŐ ;Žƌ ĐŽƌƌĞƐƉŽŶĚŝŶŐͿ Ɖ, ǀĂůƵĞ͘
ƒ WĞƌĨŽƌŵ ƐŝŵŝůĂƌůLJ ǁŝƚŚ ŽƚŚĞƌ ƐŽůƵƟŽŶƐ ĂŶĚ ƌĞĐŽƌĚ Ăůů ƚŚĞ ŽďƐĞƌǀĂƟŽŶƐ ŝŶ Ă ƚĂďƵůĂƌ ĨŽƌŵ͘
By using universal indicator
ƒ dĂŬĞ ϭ ŵ> ŽĨ ĞĂĐŚ ƐŽůƵƟŽŶ ŝŶ Ă ƐĞƉĂƌĂƚĞ ƚĞƐƚ ƚƵďĞ͘
ƒ >ĂďĞů ƚŚĞ ƚĞƐƚ ƚƵďĞƐ ĂƐ ϭ͕ Ϯ͕ ϯ ĞƚĐ͕͘ ŝŶ ŽƌĚĞƌ͕ ĂŶĚ ƉůĂĐĞ ƚŚĞƐĞ ŽŶ Ă ƚĞƐƚ ƚƵďĞ ƐƚĂŶĚ͘
ƒ ĚĚ ϭ ĚƌŽƉ ŽĨ ƚŚĞ ƵŶŝǀĞƌƐĂů ŝŶĚŝĐĂƚŽƌ ƚŽ ĞĂĐŚ ŽĨ ƚŚĞ ƐŽůƵƟŽŶƐ͘
ƒ ŽŵƉĂƌĞ ƚŚĞ ĐŽůŽƵƌ ĚĞǀĞůŽƉĞĚ ŝŶ ĞĂĐŚ ƐŽůƵƟŽŶ ǁŝƚŚ ƚŚĞ ĐŽůŽƵƌ ŐŝǀĞŶ ŝŶ ƚŚĞ ĐŚĂƌƚ ƐŚŽǁŶ ŽŶ ƚŚĞ ůĂďĞů ŽĨ ƚŚĞ
ŝŶĚŝĐĂƚŽƌ ďŽƩůĞ͘
ƒ ZĞĐŽƌĚ LJŽƵƌ ŽďƐĞƌǀĂƟŽŶƐ ŝŶ Ă ƚĂďƵůĂƌ ĨŽƌŵ͘
KďƐĞƌǀĂƟŽŶƐ
ZŽŽŵ ƚĞŵƉĞƌĂƚƵƌĞ с ͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘ Σ
By using pH paper By using universal indicator
Test
tube ^ŽůƵƟŽŶ Colour pH value Nature of the Colour pH value Nature of the
Sample
no. developed on from the ƐŽůƵƟŽŶ developed in from the ƐŽůƵƟŽŶ
the pH paper chart ƚŚĞ ƐŽůƵƟŽŶ chart
ϭ͘ __________ __________ __________ __________ __________ __________ __________
Ϯ͘ __________ __________ __________ __________ __________ __________ __________

ϯ͘ __________ __________ __________ __________ __________ __________ __________

Results
&ƌŽŵ ƚŚĞ ŽďƐĞƌǀĂƟŽŶƐ ŵĂĚĞ ŝŶ ƚŚŝƐ ĞdžƉĞƌŝŵĞŶƚ͕ ƚŚĞ ŵĞĂƐƵƌĞĚ Ɖ, ǀĂůƵĞƐ ŽĨ ƚŚĞ ŐŝǀĞŶ ƐŽůƵƟŽŶƐ ĂƌĞ
ƒ ^ŽůƵƟŽŶ ___________________ ͕ Ɖ, с ___________________
ƒ ^ŽůƵƟŽŶ ___________________ ͕ Ɖ, с ___________________
ƒ ^ŽůƵƟŽŶ ___________________ ͕ Ɖ, с ___________________

ASSIGNMENT 5

Ions in acids, bases and their solutions; The pH and pH scale

ϭ͘ tƌŝƚĞ ƚŚĞ ŶĂŵĞƐ ĂŶĚ ĨŽƌŵƵůĂĞ ŽĨ ƚŚĞ ŝŽŶƐ ƉƌĞƐĞŶƚ ŝŶ Ă ;ĂͿ ƐŽůƵƟŽŶ ŽĨ ĂŶ ĂĐŝĚ ;ďͿ ƐŽůƵƟŽŶ ŽĨ Ă ďĂƐĞ͘
–
+
Ϯ͘ ,Žǁ ĚŽ ƚŚĞ ĐŽŶĐĞŶƚƌĂƟŽŶƐ ŽĨ , O ĂŶĚ K, ĂīĞĐƚ ƚŚĞ ĂĐŝĚͲďĂƐĞ ďĞŚĂǀŝŽƵƌ ŽĨ ĂŶLJ ƐŽůƵƟŽŶ͍
3
ϯ͘ ,Žǁ ŝƐ ƚŚĞ Ɖ, ŽĨ Ă ƐŽůƵƟŽŶ ƌĞůĂƚĞĚ ƚŽ ŝƚƐ ĂĐŝĚŝĐ͕ ŶĞƵƚƌĂů ĂŶĚͬŽƌ ďĂƐŝĐ ŶĂƚƵƌĞ͍
ϰ͘ tƌŝƚĞ ƚŚĞ ŵĂƚŚĞŵĂƟĐĂů ĞƋƵĂƟŽŶ ĨŽƌ Ɖ,͘
ϱ͘ dǁŽ ƐŽůƵƟŽŶƐ y ĂŶĚ z ŚĂǀĞ Ɖ, ǀĂůƵĞƐ ŽĨ ϯ ĂŶĚ ϵ͕ ƌĞƐƉĞĐƟǀĞůLJ͘ tŚŝĐŚ ŽŶĞ ŽĨ ƚŚĞƐĞ ǁŝůů ŐŝǀĞ
;ĂͿ ƉŝŶŬ ĐŽůŽƵƌ ǁŝƚŚ ƉŚĞŶŽůƉŚƚŚĂůĞŝŶ͍ ;ďͿ ƌĞĚ ĐŽůŽƵƌ ǁŝƚŚ ŵĞƚŚLJů ŽƌĂŶŐĞ͍
ϲ͘ tŚĂƚ ŝƐ ƚŚĞ Ɖ, ŽĨ ƉƵƌĞ ǁĂƚĞƌ Ăƚ Ϯϵϴ <͍ ŽĞƐ ŝƚ ĐŚĂŶŐĞ ŝĨ
;ĂͿ ƚĞŵƉĞƌĂƚƵƌĞ ŝƐ ĐŚĂŶŐĞĚ͍ ;ďͿ ƐŽĚŝƵŵ ĐŚůŽƌŝĚĞ ŝƐ ĂĚĚĞĚ ƚŽ ŝƚ͍
ϳ͘ ,Žǁ ŝƐ ůŝƚŵƵƐ ƉĂƉĞƌ ƵƐĞĚ ĨŽƌ ŵĞĂƐƵƌŝŶŐ ƚŚĞ ĂĐŝĚŝĐͬďĂƐŝĐ ŶĂƚƵƌĞ ŽĨ Ă ƐŽůƵƟŽŶ͍
ϴ͘ ,Žǁ ŝƐ ƚŚĞ Ɖ, ŽĨ Ă ƐŽůƵƟŽŶ ŵĞĂƐƵƌĞĚ ďLJ ƵƐŝŶŐ Ă Ɖ, ƉĂƉĞƌ͍