Equilibrium Arrow

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Meigan Wu 2E
Posts: 66
Joined: Fri Sep 28, 2018 12:29 am
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Equilibrium Arrow

Postby Meigan Wu 2E » Fri Jan 18, 2019 1:38 am

Do only reactions using weak acids and bases use an equilibrium arrow?

Mona Lee 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: Equilibrium Arrow

Postby Mona Lee 4L » Fri Jan 18, 2019 1:45 am

For reactions involving a strong acid and base, you can assume 100% protonation / deprotonation, and the single arrow represents the heavy skew towards products.

MadisonB
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

Re: Equilibrium Arrow

Postby MadisonB » Fri Jan 18, 2019 2:50 am

Moreover, you use two arrows for weak acids and bases because there will be some sort of equilibrium where not everything is disassociated.

Aili Ye 4L
Posts: 58
Joined: Fri Sep 28, 2018 12:16 am

Re: Equilibrium Arrow

Postby Aili Ye 4L » Sat Jan 19, 2019 11:41 pm

Yes, only weak acids and bases use the equilibrium arrow. Strong acids and bases are considered 100% ionization in water thus only use one arrow

Saman Andalib 1H
Posts: 73
Joined: Fri Sep 28, 2018 12:16 am

Re: Equilibrium Arrow

Postby Saman Andalib 1H » Sun Jan 20, 2019 12:37 am

As Dr. Lavelle depicted in class, the arrow in the chemical equation for any reaction involving a strong acid or a strong base is simplified as being one arrow because of the overwhelming skew it has to one side of the reaction. This does not mean that the reverse reaction is not occurring, but only that it is occurring at a much lesser rate.

Vanadium Wang 4H
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: Equilibrium Arrow

Postby Vanadium Wang 4H » Sun Jan 20, 2019 10:32 am

The two way arrow is used for chemical reactions that are in equilibrium. However, when an arrow is only pointing in one direction, that indicates that the equilibrium is favoring either product or reactant.

Simmi Diwanji 2B
Posts: 32
Joined: Fri Sep 28, 2018 12:20 am

Re: Equilibrium Arrow

Postby Simmi Diwanji 2B » Sun Jan 20, 2019 3:44 pm

The equilibrium arrows should be used for all reactions in equilibrium, no matter if it is a strong or weak acid or base. However, if the reaction favors one side, the products or the reactants, than the lengths of the arrows become skewed in the respective directions.

904914909
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Equilibrium Arrow

Postby 904914909 » Sun Jan 20, 2019 5:05 pm

If a rxn completely dissociates, ie a strong acid or base, then an equilibrium arrow is not used


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