Acid Base Reactions that lead to...

We know that: acid + base --> salt + water
but what if
- the acid and base are completely neutralized, but the salt is not neutral (see lessons on pH of an acidic/basic salt)
- there is leftover strong acid/base reactant?
- there leftover weak acid/base reactant?

Good questions.

Generally the reactions that are under consideration involve 1:1 mole ratios [insert a nice happy face here]

If the leftover reactant is strong, then
-determine the moles of leftover strong
-calc conc using the total volume
-determine pH

If the leftover is weak, then....it becomes a buffer question because there will be both weak acid/base and salt of the weak present. [A solution of weak acid/base and its conjugate salt = BUFFER!]
-determine moles of leftover weak
-determine moles of salt produced (=moles of reactant all used up - that nice 1:1 mole ratio]
-write llbm reaction for acidic/basic buffer
-determine conc of weak and salt using total volume
-use Ka and/or Kb all the way to pH

If there is no leftover reactant, only product salt - and the salt is acidic and/or basic
-determine moles of salt (nice 1:1 mole ratio)
-determine total volume
-write out llbm equation
-set up ICE chart to track changes
-use Ka and/or Kb all the way to pH
***remember that it is sometimes necessary to use the Ka of a weak acid to determine the Kb of its conjugate basic salt KaKb=Kw

From today complete:
p607(4) and p608(6)
A few points about 4 and 6:
4(a) before the titration begins - pH of a weak acid (check your notes)
4(b) the 10.00mL of NaOH is suppose to represent a stage of the titration in progress
4(c) the titration is now over, more than 10.00mLof NaOH was used, but how much? A salt was also produced, a salt with the conjugate ion of the weak acid - a basic salt - need to determine Kb
6(a) before the titration begins - pH of a weak base (check your notes)
6(b) the titration is over, how much acid was required to completely neutralize the weak base? what is the concentration of the salt of the weak base that was formed? {consider the total volume from the weak base and the acid)

Also, all of the remaining questions on the Buffer/Neutralization/Titration handout are now 'fair game'. The remainder of the handout questions are not necessarily like the questions on page 607 & 608. It is not intended that the remaining questions be completed for Monday. There will be more time next week, but not that much!
As I type this post, the game plan is that I will go home and moodlize some of the solutions. If I load them up using the same technology as some of the most recent moodlized solution postings - you may require a current version of Adobe reader 9. It is now several hours later. things have been moodlized -including the aromatic organic outline. If time permits additional organic stuff and buffer/tritration/neutralization solutions will also be moodlized. BufferTitrationNeutralization solutions up to question number 10ab have been moodlized. I am finished moodlizing for today. The solutions are part way down the A/B llbm, just after the BufferTitrationNeutralization Question Sheet. Each of the PDF file names identifies the questions on that particular image.

Next week:
Monday = more calculator work
Tuesday = 7-Up lab
Wednesday = 7-Up follow-up
Thursday = Rvw
Friday = test
Finishing joke: What colour is a burp? [Burple]