Answer to Question #135470 in General Chemistry for Crystal Gonzales

Question

What is the chemical equation for lemon juice and water plus heat, invisible ink experiement?

Answer 1

Lemon contains Citric acid which has formula C₆H₈O₇ ,Now heating this lead to Co₂ and H2o(water)....

C₆H₈O₇ +(13/2)O₂ ----> 6Co₂ + 8H₂O

When the lemon juice is heated with the light bulb the carbon compounds break down. This produces carbon which is black or brown. The compound reacts with air which causes oxidation a chemical reaction