The student compared the conductivity of sodium chloride solution with the conductivity of potassium chloride solution. State one variable the student should keep constant when measuring the conductivity of the two solutions.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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