What is acid? September 24, 2024 by Admin The substances with sour taste that turn blue litmus to red and donate hydrogen ion in aqueous solution are called acids. Related Posts:What is the role of saliva in the digestion of food?What is the role of acid in our stomach?What is decimolar solution?Concepts of ChemistryWhat is a Solution? Solvent and Solute, Properties…What is Red 40?