Abstract: Acathode-ray oscillograph is directly connected to the electrodes of a conductometric titra-tion cell and the sudden change of the oscillogram is used to indicate the end-point of conductometric titration.The new technique has advantages over the usual conductometric titration methed: (1) The end-point can directly be perceived through the senses, and the graphic method for end-point location is no longer used.(2) The equipment and manipulation are more simple.

Key words: Oscillographic conductometric titrtion, Expansion or contraction of oscillogram