10) Of the compounds below, a 0.1 M aqueous solution of will have the highest pH

Question

10) Of the compounds below, a 0.1 M aqueous solution of will have the highest pH A) NaOAc, Ka of HOAc 1.8 x 10-5 B) KON, Ka of HCN = 4.0x 10-10 C) NaHS, Kb of HS 1.8 x 10-7 D) NH4NO3, Kb of NH3 1.8 x 10-5 E) NaCIO, Ka of HCIO 3.2 x 10-8 The following pictures represent aqueous solutions of binary acids of the type HA where the water molecules have been omitted for clarity. Use the picture below to answer the two questions that follow -H30+ 11) Determine the strongest acid of the set. A) A ?) ? D) D 12) Arrange the acids in order of increasing acid strength (weakest to strongest) A) D

Explanation / Answer

10)

Values of acid dissociation constant are used to estimate the relative strengths of acids. The larger the acid dissociation constant (Ka), the stronger the acid and the pH is less.

So it is clear that, for getting the higher pH value we have the solution with less Ka value.

From the given options, less Ka value (higher pH) is observed in case of option A).

So the solution will have the highest pH among the given options.

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