When NH_4Cl dissolves in water, what substances are present in high concentratio

Question

When NH_4Cl dissolves in water, what substances are present in high concentration in the resulting solution? NH_4Cl only NH_3 and MCl NH_4^+ and Cl^- NH_3, H^+, and Cl^- N^3-, H^+ and Cl^- What is the pH of 0.0010 M NH_4Cl? less than 3 exactly 3 between 3 and 7 between 7 and 11 exactly 11 greater than 11 One mole each of PCl_5(g), PCl_3(g) and Cl_2(g) is placed in a scaled 2.00 L container and then allowed to come to equilibrium. PCl_3(g) + Cl_2(g) PCl_5(g) K_c = 26.3 The equilibrium mixture contains: more than one mole of PCl_5 more than one mole of Cl_2 less than one mole of PCl_5 equal amounts of PCl_5 and Cl_2. More than one of the above is correct.

Explanation / Answer

(6) Correct option (C). Ionization of NH4Cl in water (NH4Cl dissolves to yield [NH4]+ and [Cl]- ions) can be given as:

NH4Cl(s)     <----->    NH4+(aq)    +    Cl-(aq)

(7) NH4Cl is composed of a weak base (NH4OH) and strong acid (HCl) so the medium of solution will be acidic and pH will be 3-7 (slightly acidic). Correct option (C).

(d) Correct option (E)

equilibrium constant Kc for this reaction can be given as:

Kc = [PCl5] / [PCl3][Cl2]

Here, Kc = 26.3

This indicates that [PC5] is far greater than the concentrations of [PCl3] and [Cl2]

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