If soda lime absorbs carbon dioxide what absorbs oxygen???

Question

For an experiment i need to calculate both the amount of carbon dioxide produced and the amount of oxygen taken up. I know that soda lime absorbs carbon dioxide so i can get a figure for the amount of oxygen taken up, but what substance absorbs oxygen??? I need to know so that i can use it to calculate the amount of carbon dioxide produced!

thanks!

Answer 1

well i dunno