JEE MAIN - Chemistry (2023 - 25th January Evening Shift - No. 2)
When the hydrogen ion concentration [H$$^+$$] changes by a factor of 1000, the value of pH of the solution __________
decreases by 2 units
increases by 2 units
decreases by 3 units
increases by 1000 units
Explanation
Let the initial concentration of $\mathrm{H}^{+}$ be 1
$\therefore \left[\mathrm{H}^{+}\right]_{\mathrm{i}}=1 \Rightarrow \mathrm{pH}=0$
It changes by 1000 units
$\therefore \left[\mathrm{H}^{+}\right]_{\mathrm{f}}=10^{3} \Rightarrow \mathrm{pH}=-3$
$\therefore \mathrm{pH}$ decreases by 3 units
$\therefore \left[\mathrm{H}^{+}\right]_{\mathrm{i}}=1 \Rightarrow \mathrm{pH}=0$
It changes by 1000 units
$\therefore \left[\mathrm{H}^{+}\right]_{\mathrm{f}}=10^{3} \Rightarrow \mathrm{pH}=-3$
$\therefore \mathrm{pH}$ decreases by 3 units
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