Acid and base behavior can be observed in solvents other than water. One commonl

Question

Acid and base behavior can be observed in solvents other than water. One commonly used solvent is dimethyl sulfoxide (DMSO), which can be treated as a monoprotic acid "HSol." Just as water can behave either as an acid or a base, so HSol can behave either as a Bronsted-Lowry acid or base. The equilibrium constant for self-dissociation of HSol (call it K_Hsol) is 1 Times 10^-35. Write the chemical equation for the self-dissociation reaction and the corresponding equilibrium equation. The weak acid HCN has an acid dissociation constant K_a = 1.3 Times 10^-13 in the solvent HSol. If 0.010 mol of NaCN is dissolved in 1.00 L of HSol, what is the equilibrium concentration of H_2 Sol^+?

Explanation / Answer

(a) a molcule of HSol combines with another molecule of Hsol to give cation H2Sol+ when proton is accepted and a anion Sol- when a proton is given out. So the equation is

HSol + HSol =====> Sol- + H2Sol+

Equilibrium equation is : KHSol = [Sol-][H2Sol+] = 1 x 10^35

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