A safe way of performing dangerous experiments. III. The safety box. 1. Demonstrating the reactions of alkali metals with concentrated acids of the type HX(aq) (X = F, Cl, Br, I)

Earlier publications of the series "A Safe Way of Performing Dangerous Experiments" were devoted to two instances of dangerous experiments and the applied approaches appeared to be safe enough for both the instructor and the audience. Here, we present the results obtained by systematic study of the reactions between Li, Na and K with concentrated water solutions of hydrohalic acids by using a safety box. Video clips of all experiments were prepared as an aid for those that lack experience and/or the necessary materials for safe performance of the demonstrations. Also detailed description and explanation of the observed phenomenon are given.