<prompt> Monoprotic acid isFormic acidCarbonic acidSulfuric acidCitric acid  <response>: Formic acid can donate one H, it is monoprotic.The acid equilibrium problems discussed so far have focused on a family of compounds known as monoprotic acids. Each of these acids has a single H ion, or proton, it can donate when it acts as a Brnsted acid. Hydrochloric acid HCl, acetic acid CH3CO2H or HOAc, nitric acid HNO3, and benzoic acid C6H5CO2H are all monoprotic acids.Several impoant acids can be classified as polyprotic acids, which can lose more than one H ion when they act as Brnsted acids. Diprotic acids, such as sulfuric acid H2SO4, carbonic acid H2CO3, hydrogen sulfide H2S, chromic acid H2CrO4, and oxalic acid H2C2O4 have two acidic hydrogen atomsTriprotic acids, such as phosphoric acid H3PO4 and citric acid C6H8O7, have three. 