Equilibrium ICE Table Question

In summary, the given equation shows that the equilibrium constant (Keq) at a given temperature is 4. Using an ICE table and the given information of 0.045 moles of fluorine at equilibrium in a 1 liter jar, the initial quantity of hydrogen fluoride (HF) can be calculated as 0.11 M. However, this assumes that the 1 liter measurement is an exact number and that the reaction started with only HF.
  • #1
Speedking96
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0

Homework Statement



Keq at a given temperature is 4

2 HF (g) <--> H2 (g) + F2 (g)

A 1 Litre jar contains 0.045 moles of fluorine at equilibrium. What was the initial quantity of hydrogen fluoride in the reaction jar?


2. The attempt at a solution

I set the initial concentration of hydrogen fluoride as x, and filled in the attached ICE table.

Afterwards:

4 = (0.045)(0.045) / (x-0.09)^2

x = 0.1125 and 0.0675

Therefore, the final answer is 0.1125 M
 

Attachments

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  • #2
Work looks good. Watch your sig figs. 0.090 moles of HF gas disappears, not 0.09 moles. Final answer should also be limited to 2 significant figures. So the final answer is not 0.1125 M but rather 0.11 M. This is assuming that the 1 Liter measurement is an exact measurement (i.e. it doesn't just have one sig fig but is excluded from sig fig considerations in that it is an exact number).
 
  • #3
Your answer is better than the question itself. It never said you started with HF only. Not that it can be solved without this assumption.
 

What is an equilibrium ICE table?

An equilibrium ICE table is a tool used to calculate the concentrations of reactants and products at equilibrium in a chemical reaction. It stands for Initial, Change, and Equilibrium, and is used to keep track of the changes in concentration of each species as the reaction proceeds to equilibrium.

How do you set up an equilibrium ICE table?

To set up an equilibrium ICE table, first write down the balanced chemical equation for the reaction. Then, list the initial concentrations of each species. Next, determine the changes in concentration for each species based on the stoichiometry of the reaction. Finally, use the equilibrium constant expression to calculate the equilibrium concentrations of each species.

What is the purpose of an equilibrium ICE table?

The purpose of an equilibrium ICE table is to determine the concentrations of reactants and products at equilibrium in a chemical reaction. It is also useful for predicting how changes in initial concentrations or reaction conditions will affect the equilibrium concentrations of each species.

How do you use an equilibrium ICE table to solve for equilibrium concentrations?

To use an equilibrium ICE table to solve for equilibrium concentrations, first set up the table as described in the previous question. Then, use the equilibrium constant expression and the known initial concentrations and changes in concentration to set up an equation or system of equations. Solve for the equilibrium concentrations using algebra or a calculator.

Are there any limitations to using an equilibrium ICE table?

While equilibrium ICE tables are a useful tool for calculating equilibrium concentrations, they have some limitations. They assume that the reaction reaches equilibrium, and do not account for other factors such as changes in temperature, pressure, or the presence of a catalyst. Additionally, they can only be used for reactions with known equilibrium constants.

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