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 :

2 {\NaOH}+ {\CuSO}_4 → {\Na}_2 {\SO}_4+ {\Cu}( {\OH})_2 ↓

Question : 79 of 86

Marks: +1, -0

What mass of copper hydroxide is precipitated by using

200 {\gm}

of sodium hydroxide?

[ {\H}=1, {\O}=16, {\Na}=23, {\S}=32, {\Cu}=64 \;\text " ] "\;

Solution:

\table 2 {\NaOH}+ {\CuSO}_4 ,→,\; {\Na}_2 {\SO}_4+ {\Cu}( {\OH})_2 ↓ ; 2[23+16+1],,{[64+16 × 2+2 × 1]} ;=2[40],,\;=64+32+2 ; =80,\;,=98

80 {\gm} {\NaOH}

produces

=98 {\gm} \;\text " of "\; {\Cu}( {\OH})_2

then

200 {\gm} {\NaOH}

produces

\;=\;{98}/{80} × 200

\;=245 {\gm}

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