Periodic Crystallisation of Magnesium Hydroxide in Agar‐Agar Gel

Investigations are made to get the experimental conditions for obtaining periodic crystallisation of magnesium hydroxide in agar‐agar gel. A detailed study is made on the dependence of the velocity constant ( K ), the spacing coefficient \documentclass{article}\pagestyle{empty}\begin{document}$ \left( {p = \frac{{x_{n + 1} }}{{x_n }}} \right)'$\end{document} the length of the continuous precipitate and the width of the rings on the concentrations of the inner and outer electrolytes. Using S HINOHARA 's revised coagulation theory, the flocculation value F is calculated. F = Γ + C 30 , where Γ is the characteristic concentration of the outer electrolyte for which the flocculation starts and C 30 is the reduced concentration of the reaction product. The value of the concentration of the outer electrolyte for which the flocculation stops (γ) is calculated. The dependence of F on the concentrations of the reactants is also discussed. Observation of a coneshaped precipitation is also reported.