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EVALUATION

ASSIGNMENT

The following is a sample of results obtained from a titration experiment.

  Titration number

      1

       2

      3

  Final burette reading (cm3)

    20.0

     20.0

    20.0

  Initial burette reading (cm3)

      0.0

      0.0

     0.0

  Volume of solution A used(cm3)

     20.0

     20.0

    20.0

 Questions

  1. Calculate the average volume of solution A used

     2. How many moles of:

              (i)solution B were present in 25 cm3 solution

Cloze Activity

Read the paragraph below and fill in the missing words.

Volumetric analysis/  is the process of determining unknown of one reactant from a known concentration and of another.

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Case Study

You are required to determine the concentration of solution B in moles per litre.

Procedure

Fill the burette with solution B.

Pipette 25.0cm3 of solution A into a conical flask.

Titrate solution A with solution B using phenolphthalein indicator to complete the titration table 1

Some students from Kenyatta High School did a titration experiment and came up with the following sample results. 

Titration number

      1

       2

      3

Final burette reading (cm3)

    20.0

     20.0

    20.0

Initial burette reading (cm3)

      0.0

      0.0

     0.0

Volume of solution B used(cm3)

     20.0

     20.0

    20.0

Questions

  1. Calculate the average volume of solution B used
  2. How many moles of:

        (i)  solution A were present in 25cm3 solution.

       (ii) solution B were present in the average volume.

      (iii) solution B in moles per litre.