How can you calculate the concentration of the hydrogen peroxide solution in g dm-3 if it reacted with potassium manganate(VII)?

To determine the concentration of hydrogen peroxide (H2O2) in grams per cubic decimeter (g dm^-3) from its reaction with potassium manganate(VII), it is essential to utilize stoichiometry as indicated by the balanced chemical equation for the reaction.

When potassium manganate(VII) reacts with hydrogen peroxide, a redox reaction occurs where MnO4^- ions are reduced while H2O2 is oxidized. By knowing the volume of potassium manganate(VII) solution used in the titration and its concentration, you can calculate the number of moles of MnO4^- that reacted.

Using the stoichiometric coefficients from the balanced equation, you can determine the moles of H2O2 that have reacted. Since the molar mass of hydrogen peroxide is known, you can convert the moles of H2O2 to grams, thereby enabling you to find the concentration in g dm^-3. The method relies fundamentally on the reaction ratios, showcasing how stoichiometry connects the reactants and quantifies the concentrations involved.

Other methods outlined, such as measuring temperature changes or using only the total volume of the solution without accounting for stoichiometry, do not provide the necessary chemical relationships required to