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SS3: CHEMISTRY - 1ST TERM

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  1. Volumetric Analysis (Titration)
    3 Topics
    |
    1 Quiz
  2. Heat of Neutralization & Redox Titrations
    2 Topics
    |
    1 Quiz
  3. Test for Common Gases
    2 Topics
    |
    1 Quiz
  4. Qualitative Analysis I
    3 Topics
    |
    1 Quiz
  5. Qualitative Analysis II
    2 Topics
    |
    1 Quiz
  6. Qualitative Analysis III
    3 Topics
    |
    1 Quiz
  7. Qualitative Analysis IV - Anions
    1 Topic
    |
    1 Quiz
  8. Test for Fat and Oil; Protein; Starch
    3 Topics
    |
    1 Quiz
  9. Petroleum I
    4 Topics
    |
    1 Quiz
  10. Petroleum II
    5 Topics
    |
    1 Quiz
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Topic Content:

  • Determination of Percentage Purity

When an impure chemical substance is used in titration, only the pure part of that substance takes part in the chemical reaction and is consumed. The impurity will not react. 

Example 1.2.1:

A is 0.100 mol dm-3 solution of HNO3
B is a 5.00 g mixture of Na2 CO3 and NaCl in 500 cm3 of solution.

Put A into a burette and titrate it against 25 cm3 portions of B using methyl orange as an indicator. Tabulate your burette readings and determine the average volume of A used. From your result and the information provided, calculate the 

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