Organic acids are compounds that contain two or three carboxylic acid functional groups COOH. Dicarboxylic acids. Oxalic acid. Colorless crystalline solid. Present in various plants, especially in leafy greens like spinach, and can form kidney stones in humans if consumed in excess. Malaic acid. Colorless crystals. Abundant in apples. Charies. And other fruits. Succinic acid. Colorless crystalline solid. Found in foods such as broccoli, rhubarb, sugarbeats, fresh meat extracts, various cheeses, and sauerkraut. Tri-carboc silic acids. Citric acid. White crystalline powder. Abundant in citrus fruits like lemons, oranges, limes, and grape fruits. Next topic are aromatic carboxylic acids. Thanks for watching.