Eine mit Glaselektroden ausgerüstete Strömungsapparatur (Über die Aciditätskonstante der wahren Kohlensäure und deren Dehydratationsgeschwindigkeit)

An apparatus is described which allows the mixing of comparatively large volumes (11 per minute) of the solutions of two reactants. Mixing is complete within 10 −2 seconds and the first pH‐determination of the mixture is carried out after this time, using a glass electrode. The acidity constant of true carbonic acid H 2 CO 3 could be so determined by mixing KHCO 3 with HCl and the result is in complete agreement with data from high voltage conductivity measurements. From the pH‐values obtained 5·10 −2 , 27·10 −2 and 54·10 −2 seconds after mixing, the rate of dehydration of H 2 CO 3 was obtained, and it is shown that this dehydration is not simply a first order reaction. A quadratic term is also important within the first quarter of a second.