Problem: Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 (s) ⇋ 2 HI (g) + Cl 2 (g)Certain change is then made to this mixture. Considering the change, select the effect (increase, decrease, or no change) that the change has on the original equilibrium value of the quantity. The temperature and volume are constant, unless otherwise specified. This reaction is exothermic. Please circle the letter of the correct answer.Change: Add HCl (g)          Quantity: K          Effect:a. increasesb. decreasesc. no change

FREE Expert Solution

We’re being asked to identify what would happen to the equilibrium constant (K) when HCl(g) is added in equilibrium:

2 HCl (g) + I2 (s) ⇌ 2 HI(g) + Cl2 (g)


According to Le Chatelier’s Principle, if a system (chemical reaction) is at equilibrium and we disturb it, then the system will readjust to maintain its equilibrium state.


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Problem Details

Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:

2 HCl (g) + I 2 (s) ⇋ 2 HI (g) + Cl 2 (g)

Certain change is then made to this mixture. Considering the change, select the effect (increase, decrease, or no change) that the change has on the original equilibrium value of the quantity. The temperature and volume are constant, unless otherwise specified. This reaction is exothermic. Please circle the letter of the correct answer.

Change: Add HCl (g)          Quantity: K          Effect:

a. increases

b. decreases

c. no change

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Our tutors have indicated that to solve this problem you will need to apply the Le Chatelier's Principle concept. You can view video lessons to learn Le Chatelier's Principle . Or if you need more Le Chatelier's Principle practice, you can also practice Le Chatelier's Principle practice problems.