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Borax bead test  is given by

Question

Borax bead test  is given by

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Solution

The Borax bead test is a test that can be used to identify certain elements in a substance. Here are the steps to perform the Borax bead test:

  1. Prepare a small loop of platinum or nichrome wire by bending it into a loop shape. Make sure the wire is clean and free of any contaminants.

  2. Dip the loop into a small amount of borax powder to coat it with a thin layer of borax.

  3. Heat the loop in a Bunsen burner flame until the borax melts and forms a clear, colorless bead on the wire. This step is important to ensure that the borax is in a molten state.

  4. Remove the loop from the flame and allow the bead to cool slightly. It should solidify into a glassy bead.

  5. Dip the cooled bead into a small amount of the substance you want to test. Make sure to coat the bead evenly with the substance.

  6. Heat the bead again in the Bunsen burner flame. Observe the color changes that occur in the bead.

  7. Compare the color changes to a reference chart or known standards to identify the elements present in the substance.

It is important to note that the Borax bead test is not a definitive test and may not be able to identify all elements. It is often used as a preliminary test to narrow down the possibilities and provide a starting point for further analysis.

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An unseeded BOD test is run using 25 ml of waste water mixed with 200 ml of pure water. The value of k at 20℃ is 0.22 day-1. The initial DO of the mixture is 12 mg/l. After 5 days the DO remains fixed at 4 mg/l. The remaining oxygen demand of the waste after 5 days isans.

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