Phosphoric acid or commonly called phosphoric acid is an acid that contains four oxygen atoms, one phosphorus atom, and three hydrogen atoms. Phosphoric acid in liquid form as a clear and colorless solution then in solid form as a transparent solid crystal. Phosphoric acid has the formula (H3PO4) . Phosphoric Acid Widely used as a rust inhibitor, food additive, teeth whitener, fertilizer raw material (the most important phosphorous oxygen acid, used to make phosphoric salt for fertilizer), and a component of household cleaning products.