Concentration of Solutions
Chemistry ⇒ Solutions and Colloids
Concentration of Solutions starts at 9 and continues till grade 12.
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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.
Which of the following best describes a saturated solution?
(1) Contains less solute than it can dissolve
(2) Contains more solute than it can dissolve
(3) Contains the maximum amount of solute that can dissolve at a given temperature
(4) Contains no solute
Which of the following is NOT a concentration unit?
(1) Molarity
(2) Density
(3) Molality
(4) Mole fraction
Which of the following is NOT a way to increase the concentration of a solution?
(1) Add more solute
(2) Add more solvent
(3) Evaporate some solvent
(4) Use a more concentrated stock solution
Which of the following is the correct expression for mass percent?
(1) (Mass of solute / Mass of solvent) × 100
(2) (Mass of solute / Mass of solution) × 100
(3) (Mass of solution / Mass of solute) × 100
(4) (Mass of solvent / Mass of solution) × 100
A solution contains 10 g of NaCl dissolved in 90 g of water. The mass percent of NaCl in the solution is ________%.
Fill in the blank: The concentration of a solution expressed as moles of solute per kilogram of solvent is called ________.
Fill in the blank: The number of moles of solute dissolved in 1 kg of solvent is called ________.
Fill in the blank: The process of adding more solvent to a solution to decrease its concentration is called ________.
True or False: The addition of more solute to a saturated solution will result in the formation of a precipitate.
True or False: The concentration of a solution can be expressed in terms of mass percent, molarity, and molality.
True or False: The concentration of a solution can be increased by evaporating some of the solvent.
True or False: The mole fraction of all components in a solution always adds up to 1.
