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Stoichiometric Calculations

1 M NaOH solu...

Question

$1 M N a O H$ solution was slowly added into $1000$ mL of $183.75$ g impure $H_{2} S O_{4}$ solution and the following plot was obtained. The percentage purity of $H_{2} S O_{4}$ sample and slope of the curve respectively, are

A

75 %, - \frac{1}{3}

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B

80 %, - \frac{1}{2}

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C

80 %, - 1

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D

none of these

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Solution

The correct option is C $80 %, - 1$
Moles of $N a O H$ consumed when reacted with $H^{+} = 3 \times 1$ .
Moles of $H_{2} S O_{4}$ present in sample $= 1.5$ .
Weight of $H_{2} S O_{4}$ in sample $= 1.5 \times 98 = 147 g$ .
$%$ purity $= \frac{147}{183.75} \times 100 = 80$ .
Slope of curve $= - \frac{y}{x} = - \frac{3}{3} = - 1$ (as angle of line is more than $90$ ).

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