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because in case of solid state of matter no diffusion,effusion like gases and no evaporisation and flow of some part like liquids occurs so the concentration of solid remian constant.
FOR EXAMPLE;
IF YOU HAVE THREE THINGS PLACED AT THE SAME FLOOR ,WATER,A STONE,PERFUME YOU WILL SEE AFTER SOME TIME THAT DUE TO PROCESS OF EVAPORATION ,AND DIFFUSION THE CONCENTRATION OF WATER AND PERFUME IS SOMEWHAT DEGREESED WHILE THE CONCENTRATION OF STONE IS SAME so we can say that concentration of solid remains constant.
[anbreen MSc CHEMISTRY(2nd) hazara university mansehra]
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∙ 11y ago
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How do you derive pH values for weak acids?
Every acid has a constant, called the acid dissociation constant(or Ka), which shows how much the acid dissociates to form ions in water.For an acid, the general dissociation equation is:HA -------> H+ + A-Ka = (concentration of H+) times (concentration of A-) divided by (concentration of HA)The values for concentrations are the values AT EQUILIBRIUM, where the concentrations of all three substances remain the same.If HA was a strong acid, it would completely(or almost completely) ionize in water to form its ions. Therefore, you can say that the concentration of H+ ions in the solution equal the concentration of HA. From this, you can calculate the pH by using the formula pH = - log (H+).If HA was a weak acid, however, things would be different. The acid only partially ionize in water, so you cannot say that the concentration of H+ is equal to the concentration of HA.If you know the value of the acid dissociation constant, you can easily find the concentration of H+ in the solution, and in turn calculate the pH.You know that the amounts of H+ and A- are equal. If you know the concentration of the acid HA you put in, you can calculate the H+ .
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