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How to test for Bromide (Br)
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How to Test for the Presence of Bromide Ions
What You Need
- The substance that will be tested
- A test tube
- A test tube rack
- Silver Nitrate
- A pipette
IF THE BROMIDE ION IS IN THE SOLUTION
[Using Sodium Bromide]
Sodium Bromide + Silver Nitrate --> Sodium Nitrate + Silver Bromide
NaBr + Ag(NO3) --> Na(NO3) + AgBr
If a solution contains a Bromide Ion, the Bromide will chemically bond to the Silver, and the Nitrate (NO3 Component) will bond to the metal component of the original salt.
The solution will turn a Pale Cream colour.
How to Test for the Presence of Bromide Ions
Two Common Compounds Containing Bromide are:
Sodium Bromide
and
Calcium Bromide
Method:
1. Procure all of the items, and have them in a safe place ready for the investigation.
2. Put the unknown substance into the test tube, and place the test tube onto a test tube rack
3. Using a pipette, transfer roughly 5ml of Silver Nitrate into the solution
4. Give the solution a stir using the rod. Note any colour changes
What is Bromide?
Bromide is a chemical compound containing Bromine in an ionic form. As an ion, Bromide exists with the charge 1-
Safety
Safety is important
Don't try to eat any of the chemicals. They probably don't taste that great.
Try not to break any of the containers or glass components. If you do, wear gloves and use a tissue to wipe the chemical mess.
If you get the chemical in your eye, wash it out with water
Remember
Silver Nitrate tests for all halogens (Group 7 Elements) in a [dissolved] solution. It is the particular colour of a pale cream that shows there is a Bromide ion, and not any of the other halogen ions.
[Youtube link on the reaction]
Silver Bromide is an insoluble precipitate, meaning its state will be written as solid, or (s)
How to test for Bromide (Br)
GCSE Chemistry
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