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By adding one (1) proton (H+ ion) to the base formula:example:(base ammonia) NH3 + H+(proton) --> (conjugated acid ammonium ion) NH4+
Adding a hydrogen to a polyatomic ion will increase the positive charge by one, since hydrogen typically has a charge of +1.
More than one polyatomic ion should be indicated in a chemical formula by putting parentheses around the atoms in the ions and then adding a subscript.
They both have the word COMPOUND :)
Adding a common ion to a weak acid results in a decrease in ionization of the weak acid, leading to a decrease in acidity. This is due to Le Chatelier's principle, which shifts the equilibrium towards the side that reduces the common ion concentration.