THE KINETICS OF PENETRATION : XII. HYDROGEN SULFIDE
1Laboratories of The Rockefeller Institute for Medical Research, New York and The Bermuda Biological Station for Research, Bermuda.
Abstract:
The rate of entrance of H(2)S into cells of Valonia macrophysa has been studied and it has been shown that at any given time up to 5 minutes the rate of entrance of total sulfide (H(2)S + S(-)) into the sap is proportional to the concentration of molecular H(2)S in the external solution. This is in marked contrast with the entrance of ammonia, where Osterhout has shown that the rate of entrance of total ammonia (NH(3) + NR(4) (+)) does not increase in a linear way with the increase in the external concentration of NH(3), but falls off. The strong base guanidine also acts thus. It has been shown that the rate of entrance of H(2)S is best explained by assuming that it enters by diffusion of molecular H(2)S through the non-aqueous protoplasmic surface. It has been pointed out that the simple diffusion requires that the rate of entrance might be expected to be monomolecular. Possible causes of the failure of H(2)S to follow this relationship have been discussed.
More Related Videos
Related Concept Videos
Preparation and Reactions of Sulfides
SN2 Reaction: Kinetics
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.
Catalysis
Hydrogen Bonds
SN1 Reaction: Kinetics
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...


