Bath Quakes

Proctor and Gamble has asked your company to produce scented bath balls which can be commercialized. They insist that you use sodium bicarbonate and citric acid in a powder, products which can be found at a supermarket. The binding agent must be water. However, your company must decide on the proportions needed for the substancesneeded to produce such bath balls. Authors : Johanne Patry, PH.D. and Annie Désilets