When ozone reacts with an excess of potassium iodide solution buffered with a borate buffer (pH 9.2) — Redox Reactions and Volumetric Analysis Chemistry Question
Question
When ozone reacts with an excess of potassium iodide solution buffered with a borate buffer (pH 9.2) iodine is liberated which can be titrated against a standard solution of sodium thiosulphate, this is a quantitative method for estimating O3 gas. When liberated I2 and sodium thiosulphate will react, then product is/are :
💡 Solution & Explanation
Step 1: Identify the solubilities of the starting materials. Potassium ferrocyanide and zinc sulfate are highly soluble salts in water. Step 2: Observe the reaction when mixed. Zinc ions react with ferrocyanide anions to form a white precipitate of zinc ferrocyanide, Zn2[Fe(CN)6]↓. Step 3: Since a precipitate is formed from a mixture of soluble salts, this is a precipitate formation reaction (type A). Thus, the correct option is (a).