# Pls solve Q.168. Calculate the pH of a buffer solution prepared by dissolving 30 g of $N{a}_{2}C{O}_{3}$ in 500 mL of an aqueous solution containing 150 mL of 1 M HCl. Ka for$HC{{O}_{3}}^{-}=5.63×{10}^{-11}\left[\mathrm{log}\left(\frac{133}{150}\right)=-0.05\right]$ (1) 8.197 (2) 9.197 (3) 10.197 (4) 11.197

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