Preparation of Solutions
Chemistry ⇒ Solutions and Colloids
Preparation of Solutions starts at 9 and continues till grade 12.
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See sample questions for grade 10
Describe the difference between a stock solution and a working solution.
Describe why it is important to transfer all of the dissolved solute into the volumetric flask when preparing a solution.
Explain the steps involved in preparing a 1 M solution of potassium nitrate (KNO3) in 500 mL of water.
Explain why solutions should be mixed thoroughly after preparation.
Explain why the final volume of a solution should be made up after the solute has completely dissolved.
A student is given a 2 M stock solution of H2SO4 and is asked to prepare 100 mL of 0.25 M H2SO4. Calculate the volume of the stock solution needed and describe the steps to prepare the diluted solution.
Describe the potential errors that can occur if the temperature of the solution is significantly different from the calibration temperature of the volumetric flask during preparation.
A student is given a 2 M stock solution of H2SO4 and is asked to prepare 100 mL of 0.25 M H2SO4. Calculate the volume of the stock solution needed and describe the steps to prepare the diluted solution.
Which apparatus is most suitable for preparing a solution of known concentration? (1) Beaker (2) Measuring cylinder (3) Volumetric flask (4) Test tube
Which of the following is a reason for using a volumetric flask instead of a beaker for preparing standard solutions? (1) Volumetric flasks are easier to clean (2) Volumetric flasks provide more accurate volume measurements (3) Beakers are not made of glass (4) Beakers cannot hold liquids
Which of the following is NOT a precaution to be taken while preparing a solution? (1) Use clean apparatus (2) Use distilled water (3) Add solute before measuring the solvent (4) Mix thoroughly
Which of the following is NOT a step in preparing a solution of known concentration? (1) Weighing the solute (2) Dissolving the solute in solvent (3) Heating the solution to boiling (4) Making up the volume to the mark
Fill in the blank: The _______ flask is used to prepare solutions of precise volume.
Fill in the blank: The _______ is the substance that is dissolved to form a solution.
Fill in the blank: The concentration of a solution is usually expressed in _______ per liter (mol/L).
Fill in the blank: The process of preparing a less concentrated solution from a more concentrated one is called _______.
Is it correct to use a beaker for measuring the final volume of a solution?
Is it necessary to cool a solution to room temperature before making up the final volume in a volumetric flask?
Is it necessary to use distilled water for preparing solutions in the laboratory?
True or False: A solution is always prepared by dissolving the solute in the solvent and then transferring it to a volumetric flask for dilution to the required volume.
