Thus, the half-life of a first-order reaction is derived to be independent of the initial reactant concentration. On solving, the expression for t 1/2 is determined to be a constant. As the reactant concentration declines, the half-life continues to get shorter.įor a first-order reaction, the integrated rate expression is modified by substituting the time as t 1/2 and the reactant quantity as half of its initial concentration. The formula shows that the half-life for a zero-order reaction is dependent on and directly proportional to the initial reactant concentration. On substitution of these parameters, an expression for the half-life is formulated. At t 1/2, the reactant concentration is half of its initial concentration. Depending on the reaction order, a general half-life expression can be derived from the integrated rate laws.Ĭonsider the zero-order integrated rate law. The half-life differs for each reaction type. But how long does it take for the concentration to drop to 50%? To estimate a reactant’s concentration after an elapsed time, the half-life can be used. Its atmospheric residence time is 45 years and it is banned in many countries. The time taken to reduce it to half of its initial quantity is called the half-life of the reaction, abbreviated as t 1/2.Ĭonsider the refrigerant trichlorofluoromethane, which depletes the ozone layer. During a chemical reaction, the reactant’s concentration decreases over time.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |