Citric acid solution can develop a fungus if not properly treated and stored. Place citric acid crystals in a nonmetal pot and slowly pour the boiling water into the pot, stirring with a nonmetal spoon. wikiHow's. A good measure is 1 lb. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. If you want it to be a little more potent then use 2 1/2 teaspoons of citric acid and one cup of water. Mix up citric acid powder, Epsom salts, baking soda and coconut oil to mix up a bath bomb in the kitchen. To learn more about making and storing citric acid so it lasts longer, read on! Although citric acid is commonly available in solid form, as crystalline powder, you may have applications for which a liquid form is preferable. What bad effects could I expect from using this Citric acid? Be sure to use a non-metallic container, as citric acid can react with metallic items, which is why it is used in household cleaning supplies. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/f7\/Make-Citric-Acid-Step-1.jpg\/v4-460px-Make-Citric-Acid-Step-1.jpg","bigUrl":"\/images\/thumb\/f\/f7\/Make-Citric-Acid-Step-1.jpg\/aid4959037-v4-728px-Make-Citric-Acid-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"