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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 ↓ - Chemistry

Sum

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

(ii) What is the colour of the precipitate formed?


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Solution

The Given equation is 

2NaOH + CuSO4 → Na2SO4 + Cu(OH)2

(i) Molecular weight of NaOH , Sodium hydroxide = 23 + 16 + 1 = 40

Molecular weight of Cu(OH)2 ,

Copper hydroxide = 64 + 16 + 1 + 16 + 1 = 98

Now , 40g of NaOH is used to precipitate 98g of Cu(OH)2

Hence , 200g of NaOH will be used to precipitate (98/40)200 g of Cu(OH)2 = 490g of Cu(OH).

So , 490g of copper hydroxide would be prepared using 200g of sodium hydroxide .

(ii) A light blue precipitate of Cu(OH)will be formed .

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