(Preparing the Apparatus & Materials)
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| Getting a 0.8 ml of Methylene Blue solution using a syringe. |
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| Pouring the water sample of rivers in the beakers. |
(Starting the experiment)
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| The bad odour from the water sample from different rivers |
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| Pouring water samples into the beakers. |
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| All 5 water samples + 1 Distilled water (act as a controlled) and 6 beakers for one each. |
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| Distilled water - Act as a controlled |
- Releasing the 0.8 ml of Methylene Blue solution into the water sample
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| Slowly releasing the Methylene Blue solution |
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| Completely released all 0.8 ml of Methylene Blue solution in to the water sample |
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| Stir the solution gently |
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| Continue releasing Methylene Blue solution on other water samples |
(Time recorded)
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| Record the time until the solution fully decolourise. |
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| Patiently waiting... *tick tock tick tock* |
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Finally, all water samples are filled with 0.8 ml of Methylene Blue solution
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- These solution are then kept in a box to prevent from direct sunlight.
WHY?
- It is to prevent the microorganism inside the water sample to carry out photosynthesis. Through photosynthesis, the organisms will release oxygen thus decrease the rate of decolourising of the solution.
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