Phases and Reaction Quotient (HW)

Sophia Diaz - Dis 1B
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Phases and Reaction Quotient (HW)

In homework problem 11.13 (6th edition):

Write the reaction quotient for:
P4210(s) + 16 H2O (l) --> 4H3PO4(aq) + 10 H2S (aq)

Q = (H3PO4)^4 (H2S)^10

I don't think I understand why we don't include the molecules in liquid or solid form. Why do we only include molecules in a gas or aqueous phase?

julia_lok_2K
Posts: 56
Joined: Fri Sep 28, 2018 12:25 am

Re: Phases and Reaction Quotient (HW)

It's because the concentrations of solids and liquids do not change during the reactions, so it is kind of pointless to consider solids and liquids for equilibrium.

AnnaYan_1l
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Re: Phases and Reaction Quotient (HW)

Molar concentrations of a pure substance (solid or liquid) does not change in a reaction. Therefore, solids and liquids are not included in the expression.

Nicklas_Wright_1A
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: Phases and Reaction Quotient (HW)

You can think of the solid ad liquid concentrations as being factored out and included in K.

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