What is the strongest monoprotic acid of the following set if all the acids are

Question

What is the strongest monoprotic acid of the following set if all the acids are at 0.100 M concentration? A) benzoic acid with K_a = 6.5 times 10^-5 B) hypochlorous acid with K_a = 3.5 times 10^-8 C) acetic acid with K_a = 1.8 times 10^-5 D) hydrofluoric acid with K_a = 3.5 times 10^-4 What at is the hydronium ion concentration of a 0.100 M acetic acid solution with a K_a = 1.8 times 10^-5? The equation for the dissociation of acetic acid is: CH_3COOH(aq) + H_2O(l) H_3O^+(aq) + CH_3COO^-(aq). A) 4.2 times 10^-2 M B) 4.2 times 10^-3 M C) 1.3 times 10^-2 M D) 1.3 times 10^-3 M What is the percent dissociation of a benzoic acid solution with pH = 2.59? The acid dissociation constant for this monoprotic acid is 6.5 times 10^-5. HC_7 H_8O_2(aq) + HOH(liq) H_3O^+(aq) + C_7H_8O_2(aq) A) 1.5 % B) 0.50 % C) 3.5 % D) 2.5 % What is the second stepwise equilibrium constant expression for phosphoric acid H_3PO_4? H_3PO_4(aq) + HOH(liq) H_3o^+ (aq) + H_2PO_4^-(aq) H_

Explanation / Answer

4) Ka represents the acid dissociation constant and is a measure of acid strength. In other words, more is the dissociation of the acid more becomes the Ka and hence more becomes the acid strength. In this context, hydrofluoric acid having the highest ka value is the strongest acid among others.

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