A 0.l M solution of acetic acid(CH3COOH) causes a bulb to glow bright as 0.001 M solution of HBr. Explain (Hint: think about strong and weak electrolytes). 2. An unknown white solid dissolves completely in water. Addition of Na2So4(aq) to this solution makes an insoluble white precipitate. Identify the unknown. options. A. NH4CL B. Bacl2 C. SrBr2 D. KCl 3. Identify the number of acidic protons in citric acid. please look up molecular structure of citric acid.