How do you test the freshness of baking soda you ask? It's all in the bubbles! That would be a bummer to bake something you spent some time and love on only to find out your baking soda was flat (I'm passing this onto you, because this happened to me...luckily only once. The moral of the story...check your baking soda if you haven't used it in a while). Find out below:)
"Test baking soda by adding a teaspoon-ful to a 1/2 cup hot water. If it doesn't bubble, then it's time to throw it out". - Julia Child.
Look at that...bubbles! I guess mine's good;)