Question

For the reaction:

Cr(H2O)6
3+(aq) + SCN-(aq) -> Cr(H2O)5SCN2+(aq) + H2O(l)
The following data were collected:
[Cr(H2O)63+], M [SCN-], M Rate, M hr-1
0.028 0.040 8.1x10-6
0.028 0.055 1.1x10-5
0.037 0.055 1.5x10-5

Answer 1

The question deals with the chemical kinetics and stoichiometry of chromium(III) reduction, specifically how reaction rates are influenced by reactant concentrations and the calculations related to charge and time required for redox reactions.

Step-by-step explanation:

The question relates to chemical kinetics and stoichiometry involving chromium(III) reduction. In the given reaction scenarios, we assess how the rate of a chemical reaction is affected by varying the concentrations of reactants. The examples provided illustrate various principles of redox reactions, where chromium changes its oxidation state, often accompanied by a transfer of electrons.

The stoichiometry of these reactions can be used to calculate the total charge needed for the reduction process as well as the time required for the reaction to occur under specified current conditions. In acidic or basic solutions, the species involved form different ions or compounds, such as HCrO4¯ and Cr2O72-. To solve problems like these, knowledge of half-reactions, balancing redox reactions in different media, and understanding the relationship between rate, stoichiometry and reaction order are essential.