Redox Stoichiometry A redox reaction can be used along with the stoichiometric method in order to predict the quantity of chemical involved in a chemical reaction.

Redox Stoichiometry involves several assumptions: Reactions are spontaneous Reactions are fast / immediate Reactions are quantitative (>99%) Reactions occur in stoichiometric ratios

Steps for Redox Stoichiometry 1.Write a balanced redox chemical equation 2.Convert the given measurement to moles 3.Calculate the moles of the required substance using the balanced equation 4.Convert the calculated moles to the required quantity using the appropriate conversion factor 5.Check your answer!

Redox Titrations used to determine the concentrations of substances in a solution. the progressive addition of one reagent to another until an endpoint is reached. ▫ the endpoint is indicated by a color change, often due to ion colors in solution  Ex) the measured quantity taken when the endpoint occurs is called the equivalence point.

substance in the burette is called the titrant. A standard solution (concentration is known) is used in the titration

Redox Titration Beginning Endpoint

Example: Problem: What is the concentration of a potassium permanganate solution? Design: In order to standardize a freshly prepared sample of potassium permanganate, it is titrated against samples of acidic tin(II)chloride solution. The tin(II)chloride is the primary standard. Titration of mL of mol/L acidified tin(II) solution with KMnO4(aq) Trial1234 Final Vol (ml) Init. Vol (ml) Vol Added (ml) Endpoint ColorDk pinkLt pink