To 500 ml of 2 M impure H2SO4 sample, NaOH solution 1 M was slowly added & the following plot was obtained. The percentage purity of H2SO4 sample and slope of the curve respectively are:

Engineering

Chemistry

Chemical Equation and Stoichiometric Calculation

Question

To 500 ml of 2 M impure H₂SO₄ sample, NaOH solution 1 M was slowly added & the following plot was obtained. The percentage purity of H₂SO₄ sample and slope of the curve respectively are:

75% , –1

$75 %, - \frac{1}{2}$

$50 %, - \frac{1}{3}$

none of these

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Mol. of H₂SO₄ = 2 × $\frac{500}{1000}$ = 1 mol
$∴$ Mol of H⁺ = 1 × 2 = 2
but given mol of H⁺ = 1.5
$∴$ % purity = $\frac{1.5}{2}$ ×100 = 75 % Ans.
and required mol of OH¯ = mol of H⁺
⇒ 1.5 mol
$∴$ Vol. of NaOH = $\frac{1.5}{1}$ = 1.5 litre

Slope = tan135° = –1

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