Gravimetric Analysis. Gravimetric Analysis. Gravimetric analysis is the quantitative determination of analyte concentration through a process of precipitation of the analyte, isolation of the precipitate, and weighing the isolated product. Uses of gravimetric analysis…
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Gravimetric analysis is the quantitative determination of analyte concentration through a process of precipitation of the analyte, isolation of the precipitate, and weighing the isolated product.
When Ag+ is precipitated from solution through the addition of Cl-
the (low) solubility of AgCl is further reduced by the excess of Cl- that is added, pushing the equilibrium to the right (Le Chatelier’s Principle).
Silver nitrate is added very slowly to an acidic solution containing chloride. Silver chloride nuclei form with a surface layer of ions. The “charged” AgCl particles (or colloidal particles) repel each other.
Heating the precipitate within the mother liquor (or solution from which it precipitated) for a certain period of time to encourage densification of nuclei.
During digestion, small particles dissolve and larger ones grow. This process helps produce larger crystals that are more easily filtered from solution
…is the precipitation of an unwanted species along with your analyte of interest;
… occurs to some degree in every gravimetric analysis;
… and cannot be avoided, but can be minimized by careful precipitation and a thorough washing of the precipitate.
Compounds with the same type of formula crystallizing in similar geometric forms
Precipitation of low concentration substances (i.e trace metals) by co-precipitation onto a macro quantity of another precipitate.
AgCl (s) → AgCl (colloid)