Why does degree of dissociation increase with dilution

Study Materials. Why use Doubtnut? Instant Video Solutions. Request OTP. Question : Why does degree of dissociation increase with dilution? Related Answer. On dilution, the degree of dissociation of acetic acid will……………. Assertion A : Molar conductance of a solution increases with increase in dilution.

The acid dissociation constant is a fixed property of a weak acid for a given temperature. All four of the potential answers relate in some way to the concentration of the acid. Increasing dilution will decrease the acid concentration, while decreasing volume and decreasing dilution will increase the acid concentration. Benzoic acid is a weak acid. We can guess as much from the low percentage of dissociation 1.

We can zoom in on the interesting area: below 0. Here, we can see that the degree of dissociation remains very low until the concentration falls below about 0. The relationship between the concentration and the degree of dissociation is of particular importance when dealing with electrolytes. If we have a weak electrolyte like a solution of ethanoic acid , we might expect that if we double the concentration, the electrical conductivity will double as well. As the ion concentration increases, so does the electrical conductivity.

The same occurs if we halve the concentration. The electrical conductivity will be a little above half its prior value. This is because, as the concentration increases, the degree of dissociation goes down, and as the concentration decreases, the degree of dissociation goes up.

This graph shows how the concentration of dissociated ethanoic acid changes with the total concentration. You are given 5 acidic solutions in a lab experiment, and each acid exhibits a different degree of dissociation, as seen in the table.

Which acid has better electrical conductivity? Assume that their concentration is the same and that room temperature is maintained. The electrical conductivity of a solution is a rough indication of how concentrated ions are in the solution. The greater the concentration of ions, the higher the electrical conductivity of the solution. The question tells us that all the acid solutions have the same temperatures and concentrations, so the only thing we need to know in order to find the most conductive solution is to identify the acid with the highest degree of dissociation.

In order, H U 2. Since H X has the highest degree of dissociation out of all the acids, and they are otherwise in identical conditions, the electrical conductivity of the solution of H X will be the highest of all the solutions. Ask Question. Asked 2 years, 8 months ago. Active 1 year, 2 months ago. Viewed 2k times. Improve this question. Safdar Faisal 6, 4 4 gold badges 19 19 silver badges 46 46 bronze badges.

Elhamer Yacine Elhamer Yacine 53 5 5 bronze badges. It's down to the chemical potential. Two systems with different concentrations of reactants and products may both be at equilibrium, there is nothing contradictory about that. The equilibrium constant tells you how to identify such systems. Add a comment. Active Oldest Votes. You can even calculate the explicit concentrations of all the species. All of these systems are at equilibrium.

Improve this answer. And for reaction 3, dilution pushes you farther away from equilibrium. Zhe Zhe If so, then does that mean that if you dilute a solution to a certain point, Q stops going towards K? You cannot dilute the reaction to completion. But it might get closer or farther depending on coefficients of the balanced reaction. The first is constant. The latter is not. I think that will help.

This statement is not always true - it depends on the stoichiometry of the reaction.