Concentration of Solutions

Chemistry ⇒ Solutions and Colloids

Concentration of Solutions starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Concentration of Solutions. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 10

A 2 M solution of HCl contains 2 moles of HCl in how many liters of solution?

A chemist has a 3 M stock solution of NaOH. How much of this stock solution is needed to prepare 250 mL of 0.5 M NaOH solution?

A laboratory technician needs to prepare 500 mL of 0.2 M KCl solution. How many grams of KCl (molar mass = 74.5 g/mol) are required?

A solution contains 0.5 moles of ethanol and 1.5 moles of water. What is the mole fraction of ethanol?

A solution is made by dissolving 15 g of urea (NH₂CONH₂, molar mass = 60 g/mol) in 285 g of water. Calculate the molality of the solution.

A solution is prepared by dissolving 20 g of KNO₃ in 180 g of water. Calculate the mass percent of KNO₃ in the solution.

A student prepares a solution by dissolving 0.5 moles of NaCl in 500 mL of water. What is the molarity of the solution?

Define the term 'mole fraction' as used in expressing concentration of solutions.

Describe how you would prepare 250 mL of 0.1 M NaCl solution from solid NaCl.

Explain the difference between a concentrated solution and a dilute solution.

Explain why molarity changes with temperature but molality does not.

If 100 mL of 1 M H₂SO₄ is diluted to 500 mL, what is the new concentration?

If 5 g of glucose (C₆H₁₂O₆) is dissolved in enough water to make 100 mL of solution, what is the molarity of the solution? (Molar mass of glucose = 180 g/mol)

A chemist mixes 50 mL of 2 M HCl with 150 mL of water. What is the final concentration of HCl in the resulting solution?

A laboratory technician needs to prepare 1 L of 0.25 M Na₂SO₄ solution. Calculate the mass of Na₂SO₄ (molar mass = 142 g/mol) required.

A solution contains 0.2 moles of solute dissolved in 800 g of solvent. Calculate the molality of the solution.

A solution is made by mixing 40 g of sugar (C₁₂H₂₂O₁₁, molar mass = 342 g/mol) in 160 g of water. What is the mass percent of sugar in the solution?

A solution is prepared by dissolving 12 g of NaOH (molar mass = 40 g/mol) in enough water to make 300 mL of solution. Calculate the molarity of the solution.

Describe the steps you would take to prepare 500 mL of 0.1 M KNO₃ solution from solid KNO₃.

Explain why the addition of a non-volatile solute to a solvent lowers the vapor pressure of the solution compared to the pure solvent.