Molar Conductance of Aqueous NH3 (NH4OH) at 298K

The molar conductance of a solution is defined as the conductance of all the ions produced by one mole of the electrolyte when dissolved in a particular solvent and placed between two electrodes at a distance of one centimeter from each other. It is denoted by λm and is expressed in S m2 mol-1.

Infinite Dilution

Infinite dilution refers to the state of a solution when the concentration of the electrolyte is extremely low, almost zero. At this concentration, the interionic interactions are minimized, and the conductance of the electrolyte is solely due to the movement of ions.

Molar Conductance at Infinite Dilution of Aqueous NH3 (NH4OH)

The molar conductance at infinite dilution of aqueous NH3 (NH4OH) is the highest conductance value that can be achieved for the electrolyte. This is because, at infinite dilution, the concentration of the electrolyte is almost zero, and the intermolecular interactions between the ions are minimized, allowing them to move freely.

The molar conductance at infinite dilution of aqueous NH3 (NH4OH) can be calculated experimentally by measuring the conductivities of different dilutions of the electrolyte and extrapolating the values to zero concentration. The value obtained is then corrected for the conductivities of the solvent and the temperature.

The molar conductance at infinite dilution of aqueous NH3 (NH4OH) is found to be 238.8 S m2 mol-1 at 298K.

Conclusion

The molar conductance at infinite dilution is an essential parameter for electrolytes as it determines the maximum conductance value that can be achieved for the electrolyte. In the case of aqueous NH3 (NH4OH), the molar conductance at infinite dilution is 238.8 S m2 mol-1 at 298K.