Instant Notes: Analytical Chemistry

H++OH-=H 2 O K= 1014

C(aq) +A(aq) =CA(solid) K = 1010

M(aq) +L(aq) =ML(complex) K = 1010

Ox1 +Red2 =Red1 +Ox2 K = 1012

Therefore, these reactions may be used for quantitative measurements, for

example by volumetric or gravimetric techniques (Topics C5, C7 and C8).

It should be noted that, in calculations involving solution equilibria, certain

rules should always be considered.

● Electroneutrality. The concentrations of positive and negative charges must

be equal. Sometimes, ions that do not react are omitted from the equations,

although they must be present in the solution.

● Stoichiometry. The total amounts of all species containing an element must

be constant, since no element can be created or destroyed.

● Equilibria. All possible equilibria, including those involving the solvent,

must be taken into account.

60 Section C – Analytical reactions in solution