To study the effect of dilution, concentration of water and temperature on the rate of the chemical reaction between methanal (HCHO), sodium sulphite (Na2SO3) and sodium hydrogensulphite (NaHSO3).

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F.6 Chemistry/TAS 10/P.()

Date: 21-1-2011

Objective:        To study the effect of dilution, concentration of water and temperature on the rate of the chemical reaction between methanal (HCHO), sodium sulphite (Na2SO3) and sodium hydrogensulphite (NaHSO3).

Chemicals:

0.3 M methanal                                                                                about 100 cm3

solution B (containing 0.20 M NaHSO3 and 0.05 M Na2SO3)        about 100 cm3

phenolphthalein indicator                                                                several dropping bottles shared

Apparatus:

Boiling tube x 6                                                        100 cm3 beaker x 2

Glass rod x 1                                                        250 cm3 beaker x 1

stop watch x 1                                                        600 cm3 beaker x 1

10 cm3 measuring cylinder x 1                                25cm3 measuring cylinder x 2

dropper x 3                                      white tile x 1

thermometer (-10 to 110℃) x 1        

Procedures:

A.        Effect of Dilution
  1. According to the following table, distilled water was measured using a clean 10.0 cm3 measuring cylinder. each volume of water was poured into a clean and dry boiling tube.
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The experiment was started with 0 cm3 of water in the clean and dry boiling tube.

  1. 5.0 cm3 of 0.3 M methanal was measured using another clean 10.0 cm3 measuring cylinder and was poured into the first boiling tube.
  2. 2 drops of phenolphthalein were added into the boiling tube.
  3. 5.0 cm3 of solution B was measured using another clean 10.0 cm3 measuring cylinder and was poured it into the boiling tube.
  4. The stop watch was started immediately.
  5. The reaction mixture was quickly stirred with a clean and dry glass rod.
  6. Any colour change was observed against a white ...

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