How to Make Bromine Water in the Chemistry Lab

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Bromine water is a dilute solution of bromine used as a reagent in a range of chemical experiments. While it can be made in a chemistry lab by mixing the fumes of liquid bromine directly with water, this requires the use of a fume hood and heavy protective clothing, and is not suitable for beginning chemistry classes. A more convenient method of making bromine water uses bleach and hydrochloric acid to break down sodium bromide, avoiding the hazard of handling pure liquid bromine.

Things You'll Need

  • Glass bottle with screw top
  • Flask or beaker
  • 1.1 g sodium bromide
  • 10.7 mL 1 M hydrochloric acid
  • 7.6 mL bleach
  • 32 mL distilled water
  • Label the bottle "bromine water" or "Br 2 (aq)."

  • Dissolve the sodium bromine in the hydrochloric acid, mixing the compounds in a flask or beaker. Pour the mixture into the glass bottle.

  • Add the bleach to the mixture in the bottle. Cap the bottle and swirl it gently to mix the ingredients.

  • Dilute the mixture with distilled water, swirling gently to mix.

References

  • Photo Credit Jupiterimages/Photos.com/Getty Images
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