Question

example for molarity calculation

Answer 1

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The answer can be......

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Answer 2

Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.


EXAMPLE:

What is the molarity of a solution prepared by dissolving 15.0 g of NaOH in enough water to make a total of 225 mL of solution?

Solution:

1 mol of NaOH has a mass of 40.00 g, so

Moles of NaOH=15.0g NaOH×1 mol NaOH/40.00g NaOH=0.375 mol NaOH

Litres of solution=225mL soln×1 L soln/1000mL soln=0.225 L soln

Molarity=moles of solutelitres of solution=0.375 mol0.225 L=1.67 mol/L

Some students prefer to use a "molarity triangle".



It summarizes the molarity formulas as

Moles=molarity × litres

Molarity=moles/litres

Litres=moles/molarity