Sutcliffe_Notes - Some useful things to know for Exam 3...

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Some useful things to know for Exam 3: Keep in mind what you've learnt about equilbria from Exams 1 & 2! That's how we decide how weak an acid or its conjugate is.. the size of the k! AND DON'T FORGET YOUR NON-PROGRAMMABLE CALCULATOR.. Chapter 7: Know how to find pH for a Strong Base. Remember which bases are strong AND which have two OH's! Be able to write a Ka or Kb expression for weak acids or base and use this to find K a , K b , % ionization or pH. Be able to compare strengths of a set of acids, or bases, or a mixture (all acids have a conjugate base, remember: K b = K w /K a ) Keep the "tricks" in mind; very often, if Ka < 5% of C o then you can ignore the x in the ICE table Be able to write out all the Ka expressions for a polyprotic acid and use that to help you find the concentration of any of the species involved. Remember if the first Ka is much bigger than the other and you just need pH, you can usually treat it as a monoprotic acid. But if you need A 3- then you'll have to think about the whole process; remember there are STILL sometime shortcuts f the K a 's are quite different from each other! A lot of questions in office hours come about from the trouble of recognizing weak or strong, acids vs. bases vs. salts. Maybe this may help: A WEAK acid or base will have a K given. ALSO: Learn this lists I gave!
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