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Unformatted text preview: How many mL of 0.01 M HCl must be added to 10 mL of 0.02M of KCN to make a pH = 7 solution? 5 5. (10 points) Calculate the pOH of 0.02 M solution of HOCl, its K a =3.0×108 . 6 6. (50 points) Titration: This is a multistep problem. Calculate the pH for the titration of 20 mL of 0.20 M HCOOH, K a = 1.8 x 104 , with 0.1 M LiOH. 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 a) 0 mL of LiOH have been added 7 b) 20 mL of LiOH have been added 8 c) 40 mL of LiOH have been added 9 d) 60 mL of LiOH have been added 10 9. (15 challenge bonus points). Calculate the pH of a mixture of 100 mL of 0.2 M H 3 PO 4 with 50 mL of 1.0 M NaOH. For phosphoric acid K a1 = 7.5 x 103 , K a2 = 6.2 x 108 , K a3 = 2.2 x 1013 . 11...
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This note was uploaded on 10/03/2011 for the course CHEM 112 taught by Professor Chen during the Spring '09 term at South Carolina.
 Spring '09
 CHEN
 pH, Pk

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