Question

1. If you mix a 10 mL of a 0.1 solution of glucose with a 10 mL of a 0.1 M solution of ethanol, how would you expect the conductance change?

2. How does the conductance of a strong electrolyte change as the concentration decreases?

3. How does the conductance of a weak electrolyte change as the concentration decreases?

Answer 1

1. ethanol is very poorly ionised. its P^Ka value 15.9... i.e., its Ka  value is around 10^-15.9

Ka of ethanol = [H+][C2H5O-]/[C2H5OH] = 10^-15.9

So it is regarded as covalent and therefore not acidic. It would be regarded as such an extremely poor conductor of electricity as to be a non-conductor.

solution of glucose is a non conductor. if we mix a 10ml solution glucose with 10ml 0.1M solution of ethanol we dont expect any conductance change.. almost poor conductor of electricity as to be a non-conductor.

2.Strong electrolytes undergo complete or almost complete ionization at the start. Therefore, the number of their ions present (from the same mass of the substance in solution) is constant or almost constant from the beginning, up to the point of infinite dilution. Thus, their conductivity gradually tend to a constant value with dilution.

3. if concentration decreases i.e., on dilution weak electrolyte undergoes more ionization so more number of ions forms. it was assumed that at infinite dilution undergoes complete dilution. so conductance increases to more extent