I believe you know that baking soda can be used for a lot of purposes such as getting rid of smell, cleaning clothes, putting out fire, polishing, etc. If you don't, there are a few good articles here at Gomestic
for you to read.
However, your baking soda will not do the job effectively if it is not fresh.
Therefore, before using it, you should test its freshness. You can choose any one of the following methods:
Mix a quarter teaspoon of the baking soda with a spoon of cold water, or pour a few drops of lemon juice or vinegar on half teaspoon of the baking soda.
If any one of the above mixtures produces bubbles, it shows that your baking soda is fresh.
