Ionic EquilibriumHard
Question
Which of the following solutions will have pH close to 1.0?
Options
A.100 ml of (M/10) HCl + 100 ml of (M/10) NaOH
B.55 ml of (M/10) HCl + 45 ml of (M/10) NaOH
C.10 ml of (M/10) HCl + 90 ml of (M/10) NaOH
D.75 ml of (M/5) HCl + 25 ml of (M/5) NaOH
Solution
(a) Complete neutralization ⇒ PH = 7.0
(b) $\left\lbrack H^{+} \right\rbrack_{\text{final}} = \frac{55 \times 0.1 - 45 \times 0.1}{100} = 0.01\text{ M} \Rightarrow P^{H} = 2.0$
(c) OH– is in excess.
(d) $\left\lbrack H^{+} \right\rbrack_{\text{final}} = \frac{75 \times \frac{1}{5} - 25 \times \frac{1}{5}}{100} = 0.1\text{ M } \Rightarrow P^{H} = 1.0$
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