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In class notes for November 12, 2007

# In class notes for November 12, 2007 - General Chemistry...

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In class notes for November 12, 2007 HA(aq) + H 2 O(l) H 3 O + (aq)+ A - (aq) K= K a = +[ -][ ] H30 A HA Example o HF + H 2 O H 3 O + + F - o F - (aq) + H 2 O HF(aq) + OH - o K= [ ][ ] HF OH F = K b B + H 2 O HB + + OH - K b = HBOHB K b gives the strenth of the base. pK b is the base strength. Large K b means -4a strong base, small means a weak base Example o F - + H 2 O HF + OH - (K b ) o HF + H 2 O F - + H 3 O + (K q ) o Add them together to get the sum of the equations o 2H 2 O H 3 O + + OH - (K w ) o K w =KaKb holds for acid and its conjugate base or base and its conjugate acid o Strong acids have very weak conjugate bases! Example o HF + H 2 O F - + H 3 O + o The K a for H 3 O + is = 1 and pKa=0 so it is stronger o For HF pKa=318, Ka= 6.6 x10 -4 o On the side with the stronger acid, the stronger base will also be there in the equation. K

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In class notes for November 12, 2007 - General Chemistry...

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