AKTIVITI BOD

What is the primary objective of this experiment?

• To measure the pH level of different water samples.

• To determine the amount of dissolved oxygen in various water samples.

• To test the purity of drinking water.

• To observe the reaction of water with methylene blue.

What chemical reagent is added to the water samples in this experiment?

• Litmus solution

• Phenolphthalein

• Methylene blue

• Iodine solution

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What color do all the water samples turn immediately after adding the methylene blue?

• Green

• Blue

• Yellow

• Clear

Which water sample showed the fastest and most complete fading of the methylene blue color?

• Pond water

• River water

• Filtered water

• Rain water

Based on the experimental results, what can be inferred about river water?

• It has the highest oxygen content.

• It is safe for direct consumption.

• It has the lowest oxygen content.

• It is chemically pure.