What happened to the phenolphthalein indicator during the production of gas? Explain 2. What products may have formed during the combustian of the gas? Support your answers with experimental evidence. Note: Limewater reacts with carbon dioxide to produce a milky white solid 3. The air that we breathe is approximately 20% oxygen. Think about the reaction you just wrote for the complete combustian of acetylene. Which ratio in this investigation (1/2, 1/3, 1/5, or 1/10) allowed the closest amount of oxygen needed for complete combustion? support answer with calculations