## Phase of Reactants in Rate Law

$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

Daisylookinland
Posts: 46
Joined: Fri Sep 28, 2018 12:28 am

### Phase of Reactants in Rate Law

Are there any phases of reactants that we exclude when writing rate laws? When we write K, for example, we exclude solids. Does this apply for rate laws as well?

Iona Pay
Posts: 43
Joined: Fri Sep 28, 2018 12:15 am

### Re: Phase of Reactants in Rate Law

When writing a rate law, you do not include liquid or solid reactants, or water, if it is a solvent and not a reactant. As for any other molecule that is not the solvent, if it is part of a reaction, it can be in the rate law.

Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

### Re: Phase of Reactants in Rate Law

Yeah I actually believe Dr. Lavelle actually brought this up in class, you don't need to write the phases in the rate law however if you do it should be fine as one of the solutions for the final review had phases.

Diviya Khullar 1G
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

### Re: Phase of Reactants in Rate Law

You don't include reactants that are acting as solvents. You also don't include zero order reactants but this is because they have an exponent of zero.