exam2key - CH455 Prof J A Holcombe Name Exam 2 June...

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CH455 Exam 2 Prof. J. A. Holcombe June 17,2009 Name ----------,---------,-----,---------,----- (Also write your name in the upper right hand corner ofthe back side ofthe last page ofthis exam.) 1. 2. 3. NO~"· u4rd. What is the ratio of [NH4+]:[NH3] if a solution is to be buffered at pH = 5.00. For NH) K b = 1.8x I O·s) (10 pts) pH:: (J k~·t \03 /J::. . ') + 1 ~\,,~S \A / r- P ,-1 - e !< C,\ _. 10 5. S 6 'f I 0 - 5 f If ,~h~-\~ r, .\ 5 c, 6 V J -~- .j !".U j Are the following solutions acidic (A) or basic (B)? No c..rcdi~ ~ 0.001 F NH4N03 (5 ~ 0.01 F Na2HP04 (5 A __ 0.01 F NH41hP04 (5 pt!» A NH4N02 (5 When 0.01 F Na2HP04 is dissolved in water and comes to equilibrium. .. (for phosphoric acid system pK,=2.15, pK]=7.20, pK 3 =12.15) a) What is the dominant phosphate species that would be found?---'--)-4-----'-P_O_l-f---'-?_- __ (10 b) ls the solution Dacidic or "'basic? (5 c) What is the pH? (10 \ - ?- (r lta + plc .,) -:q. 6~ ~t". ..~
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\ <.-; -7 Kp::: .v )l-IO ~ pc ;;" T I.. (;.0\ -\ '1 ) C r:' 'j. , (.. . ~'" .'T.I I. I ~ (. . . ),C,bYIO S , ",-::: ~(\_' j -:. ~Y'4 . '). _'l. .. n "'-'6 '-4~ pO/.t- .+ H~O -.;" l-\") roJ.j 4 OH-'.t kb-:.!.41)CIO- c' -:; C't 6 --J,' 0- ,) T .-; (\, J -? 0 " ~ I ,r 1"0,,,,10 +1' .J.-f- ,J.L (1.(:1.;-1!'; ~,} L -'I <: , 111:Y,!L' ., ---~ ~ 1,Cjt'f\6"'~Y (1 ,95 Y, D- '::- '1>) E ~1.G6-;I(Y") "':f. . ,. J-i I Yo (D- o /' ,. [U,~ rt;, . J" 4. a) What is the pH of a 1.0x I0.
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exam2key - CH455 Prof J A Holcombe Name Exam 2 June...

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