If you’re having trouble extracting a splinter that’s embedded deep in your skin, don’t fret. Apply a mixture of water and baking soda to the skin around the splinter, and cover it with an adhesive bandage. In a day or two, the baking soda will soften the skin around the splinter, making it easier for you to coax the splinter out with tweezers.
Baking soda starts its life as a natural mineral mined from the earth as "trona," (sodium sesquicarbonate) which is then processed into soda ash. This is dissolved in water into which carbon dioxide is added to cause the formation of sodium bicarbonate crystals. This solution is then allowed to dry and it becomes the familiar white powder we know. That's a very simple look at how common baking soda comes to life.
Once opened, baking powder usually lasts about 6-9 months. To test if baking powder is still good: place a teaspoon of baking powder in a glass of tepid water to see if it fizzes. If it does, it’s still good. It should be stored in a dry place. Do not store in the refrigerator as condensation on the can will ruin it.