Question

100 ml of 1M NaOH and 100ml of $Xg{L}^{-1}{H}_{2}S{O}_4$, both being at the same temperature, are mixed. The highest rise in temperature would occur when X is ?

• A. 0.49 g
• B. 4.9 g
• C. 49g
• D. 60g

Answer 1

Answer: (C), (D)

60g

$H_{2}S{O}_4+2NaOH\to N{a}_{2}S{O}_4+2H_{2}O$
(neutralization)
mol of $NaOH=100\times {10}^{-3}\times 1=0.1;molof{H}_{2}S{O}_4$
required $=\frac{0.1}{2}=0.05$
Mass of $H_{2}S{O}_4$ required in $100ml=0.05\times 98=4.9g$
Mass of $H_{2}S{O}_4$ per litre of solution
$=\frac{4.9\times 1000}{100}=49g$