Chemistry Form 4: Chapter 7 - Preparing a Standard Solution

• Standard solution is a solution whose concentration is known accurately.
• The solution is normally expressed in mol dm^-3
• Standard solution can be prepared by using a calculated mass of solute or dilution method from concentrated solution.

MAKING STANDARD SOLUTIONS FROM CONCENTRATED AQUEOUS

Equipment typically used when preparing a solution in a volumetric flask includes the volumetric flask and its glass stopper, pipette, a medicine dropper, and a funnel. Water can be delivered from the beaker or wash bottle.

Procedure:

MAKING STANDARD SOLUTIONS FROM CALCULATED MASS

Procedure:

• Volumetric flask is more accurate than beaker for the preparation of standard solution.
• Water is added using dropper to bring the solution to the graduation mark.
• Standard solution must be covered by stopper to prevent the contamination of the standard solution by foreign particles.
• After preparing the standard solution, shake it well to ensure thorough mixing.