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Unformatted text preview: 2 are mixed with 100 mL of 0.8 M formic acid (HCOOH), and 200 mL of 0.1 M lithium formate (HCOOLi); K a (HCOOH)= 1.8×104 . 4. (10 points) Calculate the pH of 0.3 M solution of hydrazine N 2 H 4 , its K b =1.7×106 . 5. (15 challenge bonus points). How many grams of dry NaOH have to be added to 150 mL of water to make a solution with pH=12.5? 6. (50 points) Titration: This is a multistep problem. Calculate the pH for the titration of 20 mL of 0.80 M benzoic acid C 6 H 5 COOH, pK a = 4.20, with 0.4 M RbOH. a) (11 points) Before any base is added. b) (13 points) After 20 mL of base is added. c) (13 points) After 40 mL of base is added d) (13 points) After 60 mL of base is added...
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 Spring '09
 CHEN
 pH, Pk, ml

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