Result of Only Adding One of the Reactants

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Joon Chang 2F
Posts: 59
Joined: Fri Sep 28, 2018 12:25 am

Result of Only Adding One of the Reactants

Postby Joon Chang 2F » Sun Jan 13, 2019 3:07 pm

Can someone explain what will happen if only one of the reactants is added to a chemical equation?
For example, in the equation 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g), if only NH3 is added to the equation, will equilibrium shift toward the products?

David S
Posts: 54
Joined: Fri Sep 28, 2018 12:15 am

Re: Result of Only Adding One of the Reactants

Postby David S » Sun Jan 13, 2019 3:17 pm

Yes, because by increasing the concentration of any one reactant, the denominator (i.e. the product of reactant concentrations) of the quotient Q will become greater than the denominator of K at equilibrium. Thus, Q < K, and reaction will proceed to balance this larger denominator out by creating more product.

Timothy_Yueh_4L
Posts: 57
Joined: Fri Sep 28, 2018 12:28 am

Re: Result of Only Adding One of the Reactants

Postby Timothy_Yueh_4L » Sun Jan 13, 2019 3:18 pm

By adding more NH3 to the chemical reaction, you increase the concentration of the that particular chemical on the reactants side which gives an Q constant that is lower than the equilibrium constant, Kc. This will result with the forward reaction being favored as more product will be formed until the original equilibrium constant is attained.

Melody P 2B
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

Re: Result of Only Adding One of the Reactants

Postby Melody P 2B » Sun Jan 13, 2019 4:30 pm

Then, if you were to remove some reactant would the reaction shift left? Towards the reactants to compensate for the loss?

Edward Xie 2E
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

Re: Result of Only Adding One of the Reactants

Postby Edward Xie 2E » Sun Jan 13, 2019 4:50 pm

Then, if you were to remove some reactant would the reaction shift left? Towards the reactants to compensate for the loss?


Yep, since Q > K the reaction will shift towards the reactants.


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