A complex chemical reaction follows the rate law . If the concentration of reactant is kept constant and reactant is intentionally taken in very large stoichiometric excess (Ostwald isolation method),

Question

A complex chemical reaction follows the rate law $r = k[A]^x [B]^y$. If the concentration of reactant $A$ is kept constant and reactant $B$ is intentionally taken in very large stoichiometric excess (Ostwald isolation method), the apparent (pseudo) order of the reaction determined experimentally under these specific conditions will be:

Prashant Kotian · Accepted Answer

Correct answer: C. When reactant is in large excess, its concentration remains practically unchanged during the reaction. The term becomes a constant and merges with the true rate constant to form a pseudo rate constant . The new rate law becomes . The experimentally observed order will be just .

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