Analytical Chemistry of Carbon Compounds

53 ANALYTICAL CHEMISTRY OF CARBON COMPOUNDS Carbon dioxide obtained by oxidation of carbon compounds can be determined by absorption in a known excess of standard NaOH, when a mixture of carbonate and hydroxide are formed, which can be titrimetrically analysed. 

Carbonates of metals, if thermally unstable, can be analysed by heating to the appropriate temperature d the loss in weight gives the % carbon dioxide. 

Acidimetric titrations of carbonates and their mixture with either hydroxide or bicarbonate are simple to carry out with acid-base indicators or potentiometrically using a glass electrode and a pH meter. 

Thiocyanates can be determined gravimetrically as the copper(l) thiocyanate or titrimetrically using silver nitrate or mercury(II) nitrate. 

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