A new cell for coulometric titration with externally generated reagent
s is described. This new generator is especially useful when gas bubbl
es are formed during the titration (e.g. in the acid-base methods). Gr
avitation floating of the gas bubbles is assisted with a backward syst
em of the drains in the peristaltic pump supplying the cell. The cell
was tested with samples of HCl and CH3COOH.