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Sunday, August 28, 2011

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.

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