What is the molarity of SO4^2- in a solution prepared by mixing 2.17 g of alum, KAl(SO4)2•12H2O, with 175 mL of water? The molecular weight of alum is 474.39 g/mol. Report your answer to three significant figures.

The concentration of sulfate ions in the solution is 0.0522 M

Explanation:

To calculate the the molarity of solution:, we use the equation:

Given mass of alum = 2.17 g

Molar mass of alum = 478.39 g/mol

Volume of solution = 175 mL

Putting values in above equation, we get:

The chemical equation for the ionization of alum follows:

1 mole of alum produces 1 mole of potassium ions, 1 mole of aluminium ions, 2 moles of sulfate ions and 12 moles of water

So, concentration of sulfate ions =

Hence, the concentration of sulfate ions in the solution is 0.0522 M

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