Double Arrows

[ahuang]

I understand that you use a single arrow in an equation to show when a strong acid or base completely dissociates in water, but does that mean you use double arrows for everything that is not a strong acid or base? In the homework, none of the equations used double arrows. Would we be penalized on the final exam if one uses the wrong arrows (-> versus <->)?

[Kallista McCarty 1C]

Double arrows just show that the reaction is reversible! It is a good habit to get into to use them when writing the equations for weak acids and bases but I don't think it is required.

[andrewcj 2C]

It is always used in equilibriums to show a dynamic constant state of simultaneous reaction.

[Matthew Tsai 2H]

Not sure if you will be penalized, but it would probably be best to get used to including double arrows for equilibrium reactions.