That is, equilibrium constants are written in terms of products/reactants or for Ksp, in terms of products only.

Why doesn't the rate law also focus on products?

I usually see it written in terms of reactants.

  • 3
    $\begingroup$ Because products do not influence the rate of a non-equilibrium reaction, while products are the reactants of the reactants in the backward reaction in equilibrium $\endgroup$ – Greg Apr 26 '17 at 0:32
  • $\begingroup$ If the reaction is $A \rightarrow B$ then you can write $dA/dt=-k_1A$ or $dB/dt=+k_1A$, to solve you also have to know how much A and B are present initially, if in equilibrium $A = B$; $K_e=[B]_e/[A]_e$ $\endgroup$ – porphyrin Apr 26 '17 at 8:38

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