Double replacement reactions are generally considered irreversible since the formation of an insoluble precipitate provides a driving force that proceeds in one direction only. With the Stoichiometry and Solubility: Mole Ratios and Chemical Formulas—ChemTopic™ Lab Activity, find the optimum mole ratio for the formation of a precipitate in a double replacement reaction and use this information to predict the chemical formula of the precipitate. Available as part of the Molar Relationships & Stoichiometry—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.