Which of the following weak acids has the strongest conjugate base? dihydrogen phosphate, Ka = 6.2 x 10-8 hydrocyanic acid, Ka = 4.0 x 10-10 nitrous acid, Ka = 4.5 x 10-4 benzoic acid, Ka = 6.3 x 10-5 acetic acid, Ka = 1.8 x 10-5
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Which of the following weak acids has the strongest conjugate base? A) nitrous acid, Ka = 4.5 × 10^-4 B) benzoic acid, Ka = 6.3 × 10^-5 C) dihydrogen phosphate ion, Ka = 6.2 × 10^-8 D) acetic acid, Ka = 1.8 × 10^-5 E) hydrocyanic acid, Ka = 4.0 × 10^-10
Prashant B.
Which of the following weak acids has the strongest conjugate base in an aqueous solution? a) acetic acid, Ka = 1.8 x 10^-5 b) hydrocyanic acid, Ka = 4.0 x 10^-10 c) hydrogen sulfite ion, Ka = 6.2 x 10^-8 d) nitrous acid, Ka = 4.5 x 10^-4 e) phosphoric acid, Ka = 7.5 x 10^-3
Adi S.
Several acids are listed here with their respective equilibrium constants. $$\begin{aligned} &\mathrm{HF}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\ell) \rightleftarrows \mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq})+\mathrm{F}^{-}(\mathrm{aq})\\ &K_{\mathrm{a}}=7.2 \times 10^{-4}\\ &\mathrm{HPO}_{4}^{2-}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\ell) \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq})+\mathrm{PO}_{4}^{3-}(\mathrm{aq})\\ &K_{\mathrm{a}}=3.6 \times 10^{-13}\\ &\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\ell) \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq})+\mathrm{CH}_{3} \mathrm{CO}_{2}^{-}(\mathrm{aq})\\ &K_{\mathrm{a}}=1.8 \times 10^{-5} \end{aligned}$$ (a) Which is the strongest acid? Which is the weakest acid? (b) What is the conjugate base of the acid HF? (c) Which acid has the weakest conjugate base? (d) Which acid has the strongest conjugate base?
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