A chemist prepares a sodium sulfate solution for a conductivity experiment
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A chemist prepares a sodium sulfate solution for a conductivity experiment. The solution is analyzed and found to contain 1.20×1024 sulfate ions (SO42−).
Respond to the prompts below.
(a) Calculate the amount, in moles, of sulfate ions present in the solution.
(b) Determine the amount, in moles, of sodium sulfate formula units present in the solution.
(c) Compute the mass of sodium sulfate, in grams, dissolved in the solution. The molar mass of Na2SO4 is 142.04gmol−1.
(d) Explain why the stoichiometric relationship used in part (b) is consistent with the requirement of overall charge neutrality in the dissolved compound.