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In class notes for November 30, 2007

In class notes for November 30, 2007 - General Chemistry...

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General Chemistry Lecture 102a In class notes for November 30, 2007 Chapter 8 OWL due December 7 at 11:59pm Regrade requests due Monday CO 2 blood buffer handout answers will be posted on OAK Last lecture o Buffers and CO 2 blood buffer Today o Titrations Titration calculations o Titrating strong acid with strong base Convert from concentration to moles H 3 O + Calculate acid remaining (acid/base neutraizatoin goes to completion) n(H 3 O + ) final = n(H 3 O + ) initial –n(OH - ) added Convert bact to concentration. Remember to take into account that the volume has changed as you’ve added base. Past the equivalence pt. simply calculate n(OH - ) excess and new volume to get [OH - ].pH= 14.0 – pOH Strong Acid and Strong Base Weak acid and Strong base 100mL 0.010 M HCl 100mL 0.010M Acetic acid Initially pH = -log(0.01)=2.0 Use ICE table, solve for x= the square root of 1.8x10 -7 pH= 3.37 Add 20 mL of 0.010 M Na OH ---------------------------------------------------------- SEE A SEE B 50 mL of NaOH added total ---------------------------------------------------------- SEE C SEE D Know that half way to the equivalence
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