First slide

PH of strong acids and strong bases

Question

To a one litre solution containing 4 grams of sodium hydroxide, 9.8 grams of sulphuric acid is added p^H of the solution at 298 K is

Moderate

A

2
B

2.3010
C

7
D

1

Solution

Number of gram equivalents of base = 4/40 = 0.1
Number of gram equivalents of acid = 9.8/49 = 0.2
Nature of resultant solution is acidic
Number of gram equivalents of acid left = (0.2 - 0.1)
Number of gram equivalents of acid left = 0.1
$\begin{matrix} ∴ [H^{+}] = 0 .1 \times \frac{1}{1} \\ [H^{+}] = 0 .1 M \\ p^{H} = 1 \end{matrix}$

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