Ans: A salt of a weak acid and the weak solution of the acid which is acidic or basic depends on the ka and kb value of the base and the acid-forming it. A hydrogen-containing substance that is capable of donating a proton to another substance is called an acid. When it can accept a hydrogen ion from an acid then it is called the base. Acids are identified by their sour taste. Acids also can turn blue litmus red. Bases can turn red litmus blue. Bases have a bitter taste and the texture is slippery. Hence ammonium carbonate is aqueous.