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Practice Problems on Concentration & Molarity

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Solve molarity practice problems involving moles, volume conversions, dilutions, molar mass, and mass percent calculations. Learn to calculate concentrations in different scenarios. Improve your chemistry skills!

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Practice Problems on Concentration & Molarity

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  1. Concentration

  2. Molarity (M)

  3. Practice • One liter of 5.0 M HCl contains how many moles of HCl? M = 5.0 mol= ? L = 1 L x = 5 mol

  4. Practice • 55mL of 2.4M glucose contains how many moles of glucose? • Need to change mL to L M = 2.4 mol = ? L = 55mL  0.055L x = 0.132 mol

  5. Practice • How could we make a 0.100M solution of CuSO4 * 5H2O? • Molar mass = 249.6 g/mol x = 0.100 mol 24.96 g

  6. Dilutions M is concentration in Molarity V is volume (can be mL of L)

  7. Practice • How can we make 500mL of 1.00M HCl from 6.00M HCl? V1 = 500mL M1 = 1.00 M V2 = ? M2 = 6.00M x = 83.3 mL or 0.0833 L

  8. Practice • What is the molarity of a 250mL solution containing 9.46g CsBr? • Molar mass of CsBr = 213 g/mol 0.0444 mol CsBr 0.176M

  9. Percent by Mass ** remember that solution is (solute + solvent)

  10. Practice • What is the mass percent of a solution made from 199g of NiBr2 in 5.00x102 g of water? • Solution = solute + solvent Solute = 199g Solution = 500g + 199g = 699g (solvent) (solute) 28.5% NiBr2

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