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A buffer solution is made up of acetic acid \( \left[\mathrm{pK}_{\mathrm{a}}=5\right] \)
P having conc. \( =1.5 \mathrm{M} \) and sodium acetate having

W conc. \( =0.15 \mathrm{M} \). What is the number of \( \mathrm{OH}^{-} \)ions present in 1 litre solution?
(1) \( 10^{-6} \mathrm{~N}_{\mathrm{A}} \)
(2) \( 10^{-10} \mathrm{~N}_{\mathrm{A}} \)
(3) \( 10^{-3} \mathrm{~N}_{\mathrm{A}} \)
(4) \( 10^{-4} \mathrm{~N}_{\mathrm{A}} \)
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