I. Consider the following equilibrium system at 575K: NH4Cl(s)? NH,(g) + HCl(g)

Question

I. Consider the following equilibrium system at 575K: NH4Cl(s)? NH,(g) + HCl(g) K,-0.0792; ?}{-+ 176 kJ/mol 10.0 g sample of solid ammonium chloride is placed in a rigid, evacuated 3.0 L container that is sealed and he system comes to equilibrium with some solid NH CI remaining in the container. (a) Write the equilibrium expression in terms of Kp. (b) Calculate the partial pressure of NHo(g), in atm, at equilibrium at 575 K. tial pressure of the ammonia is increased, does the amount of NH.CI (s) increase, decrease, or stay the same as the equilibrium is reestablished? Justify your answer (ii) Once the equilibrium is reestablished, is the Kp greater than, less than, or equal to the Kp before the partial pressure of ammonia is increased? (d) The temperature is increased to 700K. Does the HCl (g) increase, decrease, or remain the same? Justify your answer. In another experiment, 25.00 mL of 0.400 M NHCI(aq) is prepared. The ammonium ion reacts with water according to the equation: NH,' (aq)+HOO)NH(a)+ HO (aq) (e) Calculate the equilibrium constant for the reaction of the ammonium ion with water. K&(NH)-18 x 10 (0 Calculate the pH of the solution. (8) Calculate the pH of the solution after 20.00 mL of 0.S00M NH,(aq) is added. Assume the volumes are additive.

Explanation / Answer

Kp=Pnh3.Phcl/

1 because due to no comoressibilty in solid and liquid then the concentration assume to be 1

b.Pnh3=.0792*Phcl

C.amount of NH4Cl increased bcz equlibrium will shift in keft direction

d.

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