Principle

The electrical conductivity of an electrolytic solution is dependent not only upon the type and concentration of the electrolytes, but also other state values. Thus, an increase in conductivity is generally observed with an increase in temperature. This is fundamentally due to the exponential decrease of the solutions's viscosity. In aqueous solutions a limit is reached at approximately 90 °C. Above this temperature the conductivity again decreases.

Benefits

• Experimental procedure without dangerous chemicals
• Simplified implementation: all pre-settings already prepared
• Accurate results by conductivity probe with integrated sensor Pt 1000

Tasks

Determine the temperature dependence of the conductivity of a 10% sodium chloride solution from 20 °C to approximately 60 °C.

Learning objectives

• Electrolytic resistance
• Conductance
• Specific and molar conductivity
• Ion mobility
• Equivalent conductance at infinite dilution
• Kohlrausch's law
• Ostwald's law of dilution
• Transference numbers
• Viscosity

Necessary accessories

• Precision balance 620g/0.001g