The reaction between potassium iodide KI and lead nitrate Pb NO3 2 is a precipitation reaction that forms lead iodide PbI2 and potassium nitrate KNO3 as products:2 KI aq + Pb NO3 2 aq 2 KNO3 aq + PbI2 s In this reaction, light intensity does not have a significant effect on the rate of reaction. The rate of reaction is primarily influenced by factors such as concentration, temperature, and the presence of a catalyst.However, if we were discussing a photochemical reaction, light intensity would play a crucial role in the rate of reaction. Photochemical reactions are those that are initiated or accelerated by the absorption of light energy. In such reactions, the rate of reaction is directly proportional to the intensity of light, as described by the Bunsen-Roscoe law of photochemistry. But the reaction between potassium iodide and lead nitrate is not a photochemical reaction, so light intensity does not have a significant effect on its rate.