Question

In: Chemistry

part A: Given the two reactions H2S⇌HS−+H+, K1 = 9.64×10−8, and HS−⇌S2−+H+, K2 = 1.53×10−19, what is the...

part A: Given the two reactions

H2S⇌HS−+H+, K1 = 9.64×10⁻⁸, and

HS−⇌S2−+H+, K2 = 1.53×10⁻¹⁹,

what is the equilibrium constant Kfinal for the following reaction?

S2−+2H+⇌H2S

part B:Given the two reactions

PbCl2⇌Pb2++2Cl−, K3 = 1.83×10⁻¹⁰, and

AgCl⇌Ag++Cl−, K4 = 1.12×10⁻⁴,

what is the equilibrium constant Kfinal for the following reaction?

PbCl2+2Ag+⇌2AgCl+Pb2+

Expert Solution

part A)

H2S <------------->HS⁻ + H+, K1 = 9.64×10⁻⁸, and

K1 = [HS-][H+] / [H2S] ----------------------------(1)

HS− <--------------------> S²⁻+ H+, K2 = 1.53×10⁻¹⁹,

K2 = [S^2-][H+] / [HS-] -----------------------------(2)

S²⁻ + 2H+ <----------------> H2S

Kfinal = [H2S] / [S^-2][H+]^2 -----------------------(3)

by doing 1 / (1) x (2) we get equation (3)

Kfinal = 1 / K1 x K2

= 1 / 9.64×10⁻⁸ x 1.53×10⁻¹⁹

= 6.78 x 10^25

K_final = 6.78 x 10^25

part B )

K_final = K₃ / K²₄

= 1.83×10⁻¹⁰ / (1.12×10⁻⁴)^2

= 0.0146

= 1.46 x 10^-2

K_final = 1.46 x 10^-2

queen_honey_blossom answered 5 months ago

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