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Writing equations

Posted: Sun Jan 20, 2019 6:24 pm
by Valeria Viera 1B
I took 14A a long time ago so I’m really rusty when it comes to writing equations
Can someone help me by explaining the steps to writing an equation where a weak base/acid reacts with water to make H3O or OH? Like how do you know where the H/proton is being transferred to? (For example in NH3 + H2O or Cl+ H2O )

Re: Writing equations

Posted: Sun Jan 20, 2019 6:26 pm
by Mahir_Hasan2C
If we were to look at the example of whether NH3 is a base, it would be easier to rely on the Lewis structure. We see that NH3 has a lone pair, this can make a bond with one of the Hydrogens of water and create a hydroxide concentration. All in all, when in doubt make the lewis dot structure.

Re: Writing equations

Posted: Mon Jan 21, 2019 1:27 pm
by Andrew Bennecke
We would use the amphoteric compound, Ammonia/NH3, that acts as a weak base in this reaction In order to create Ammonium, NH4+, by mixing it with water. This would give us the equation NH3 (aq) + H2O (l) <-> NH4+ (aq) + OH- (aq).

Re: Writing equations

Posted: Wed Feb 13, 2019 11:23 pm
by 605168557
Is there a general structure to follow when writing an equilibrium expression when only given the one reactant for example HClO2(aq)? I understand that the H3O+(aq) ion in addition to the acid's conjugate base(ClO2-(aq)) goes on the right side (product side) of the expression but is H2O(l) always included on the reactant side as well?