ICSE Class 10 Chemistry 2019 Solved Paper

Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation :
2‌NaOH+CuSO4→Na2SO4+Cu(OH)2↓

Question : 79

Total: 86

What mass of copper hydroxide is precipitated by using 200‌gm of sodium hydroxide?
[H=1,O=16,Na=23,S=32,Cu=64‌ ] ‌

Solution:

2‌NaOH+CuSO4	→	‌Na2SO4+Cu(OH)2↓
2[23+16+1]	‌	[64+16×2+2×1]
=2[40]	‌	‌=64+32+2
=80	‌	=98

If 80‌gm‌NaOH produces
=98‌gm‌ of ‌Cu(OH)2
then 200‌gm‌NaOH produces
‌=‌

×200
‌=245‌gm

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