Of the compounds below,a 0.1 M aqueous solution of ________ will have the highest pH. A)KCN, K_a of HCN = 4.0 × 10^-10 B)NH₄NO₃, K_b of NH₃ = 1.8 × 10^-5 C)NaOAc, K_a of HOAc = 1.8 × 10^-5 D)NaClO, K_a of HClO = 3.2 × 10^-8 E)NaHS, K_b of HS^- = 1.8 × 10^-7

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Quizplus · Accepted Answer

KCN will have the highest pH because it is the salt of a weak acid (HCN) and a strong base (KOH). The weak acid has a very low Ka value, indicating it barely ionizes in water, leading to a basic solution due to the hydrolysis of the cyanide ion (CN-), which increases the pH.

Of the Compounds Below,a 0