# Is there a way to calculate what the products will be for SO2+Br+H2O?

## In a textbook problem, my task was to write down the products and calculate the coefficients for $S {O}_{2} + B r + {H}_{2} O$ I had only practiced reactions with two participants before that moment. I failed to guess what the products would be, and went googling. The reaction is as follows: $S {O}_{2} + B r + 2 {H}_{2} O \to 2 H B r + {H}_{2} S {O}_{4}$ Was there any way to calculate the products in advance?

Here we now that $S {O}_{2}$ likes to form an acid. The most probable one is ${H}_{2} S {O}_{4}$. Following that we can assume that it will take the oxygen and hydrogen from water. We are left with one hydrogen and bromine. What can they make? $H B r$!