Experiment (practical measurement)

Determination of stoichiometry

Continuous variation methods

There are different methods of determining the stoichiometry, e.g., Continuous Variation Methods, Slope Ratio Method, Mole Ratio Method, etc. Because the Continuous Variation Method is the most popular among these, this method is adopted here to determine the stoichiometry.

In order to determine the stoichiometry by the Continuous Variation Method, the following four points have to be considered and carried out.

· Keeping the sum of [H]_t and [G]_t constant (α)

· Changing [H]_t from 0 to α

· Measuring [C]

· Data treatment (Job’s plot)

The stoichiometry (a/(a+b)) is obtained from the x-coordinate at the maximum in Job’s curve, where the y-axis is [C] and the x-axis is.

For the comprehensive of the theoretical background of the Continuous Method, the required Equation are (4)-(7) and (9)-(11).

[H]_t and [G]_t will be substituted by the function of x and α from Equations (9) and (10).