Which of the following,when added to 20 mL o | vedclass

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(A) The $pH$ of an acidic solution decreases as the concentration of $H^+$ ions increases. The initial concentration of $HCl$ is $0.01 \ M$ in $20 \ m

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$20 \ mL$ of $0.02 \ M \ HCl$

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(A) The $pH$ of an acidic solution decreases as the concentration of $H^+$ ions increases. The initial concentration of $HCl$ is $0.01 \ M$ in $20 \ mL$. We calculate the final concentration $(M_{final})$ for each option:$M_{final} = \frac{M_1 V_1 + M_2 V_2}{V_1 + V_2}$For option $A$: $M_A = \frac{0.01 	imes 20 + 0.02 	imes 20}{20 + 20} = \frac{0.2 + 0.4}{40} = 0.015 \ M$. Since $0.015 \ M > 0.01 \ M$,the $pH$ will decrease.For option $B$: $M_B = \frac{0.01 	imes 20 + 0.005 	imes 20}{40} = 0.0075 \ M$. Since $0.0075 \ M For option $C$: $M_C = \frac{0.01 	imes 20 + 0.01 	imes 20}{40} = 0.01 \ M$. The $pH$ remains unchanged.For option $D$: $M_D = \frac{0.01 	imes 20 + 0.005 	imes 40}{20 + 40} = \frac{0.2 + 0.2}{60} = 0.0066 \ M$. Since $0.0066 \ M Therefore,only option $A$ results in a higher concentration of $H^+$,leading to a decrease in $pH$.

Which of the following,when added to $20 \ mL$ of a $0.01 \ M$ solution of $HCl$,would decrease its $pH$?

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