Über die dilatometrisch indizierten Titrationen

A newly developed dilatometer is described that permits the continuous determination of volume changes in chemical reactions in solutions very exactly. This volume change is applied to indicate the neutralizing reactions of the acids and bases HCl, HNO₃, HClO₄, H₂SO₄, H₅JO₆, LiOH, NaOH, KOH, RbOH and CsOH. The equivalence point is obtained as a point of intersection between two straight lines (reaction line and excess line) with an accuracy of 1 ‰. A strict linearity between the amount of base resp. acid and the position of the end-point is indicated in all tested neutralizations. The determinations of the molar volume changes of neutralizing reactions as being concentration dependent suggest that the equationΔV=ΔV ₀+a \(\sqrt c \) +bc is applicable to all tested systems.