A buffer solution is made up of acetic acid \( \left[\mathrm{p} K_{a}=5\right] \) having conc. \...

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A buffer solution is made up of acetic acid \( \left[\mathrm{p} K_{a}=5\right] \) having conc. \( =1.5 \mathrm{M} \) and sodium acetate having conc. \( =0.15 \mathrm{M} \). What is the number of \( \mathrm{OH}^{-} \)ions present in 1 litre solution?
(a) \( 10^{-10} N_{A} \)
(b) \( 10^{-4} N_{A} \)
(c) \( 10^{-3} N_{A} \)
(d) \( 10^{-6} N_{A} \)
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