FT_Pset04_2008

FT_Pset04_2008 - “Dibble/m Set #4 (HM/mm} [52“ wag)...

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Unformatted text preview: “Dibble/m Set #4 (HM/mm} [52“ wag) C5342??? 33w: MoMDM MM, 3a? (771,} M away) EVTM Salmons M 92/21/2050 2% 7%, 493+ 3 art/OM. $6 We»? as pig/4677f fifléBAPHS/fim U/ew afiaM msww. Baum» (aw/mm,” {twice mam pMEJ (its—g] :7 FOR (WENT: (This 003%,; aSSlSMW) f ’00 Qw‘hm @4@ 66/06..) (#2/ C5“ #Qfiflz/v AU. AIM/QM} @ Is a kinetic or an equilibrium model more likely to be useful in each of > the following situations? Qualify, if necessary. a. Toxic components of an antifouling ship paint are leaching from a yacht into a river. b. Deicing salt that has been sprinkled on the sidewalk is dissolving into a puddle. c. There is a concentration of volatile fuel oil constituents in the head- space of a tank of heating oil. @( 9) The chemistry laboratory returns to you the follovving water analysis: pH = 6.3 Na‘“ = 2 mg/liter K+ = 0.5 mg/liter Mg2+ = 0.3 mg/liter C1“ = 1.5‘mg/liter 302“ = 2 ring/liter N0; = 0.5 mg/liter HCO; 2 0.9 mg/liter. Do you believe this analysis is both complete and accurate? Explain why or Why not. @. 10. A body of water contains 10—5 mol/liter of carbonic acid, HZCOg‘. a. What is the concentration of bicarbonate, HCO; , at pH values of 4, 7, and 10? b. Use the same pH conditions in (a) but in seawater having an ionic strength of 0.5 M. (Because pH is properly defined on the basis of hydrogen ion activity, ionic strength corrections need only be made for HCO; .) Vail cngorr (0w Mai) Mflr) ~ 12. Tritium, a radioactive isotope of hydrogen, has a half—life of approxi- mately 12 years. a. What is its decay constant? b. If a sample of water containing only tritium is sealed up for 25 years, what will be the molar ratio of tritium to its decay product, helium-3, M ~ M M “A at the end of this time period? @ 24. If 10‘3 mol of baking soda (sodium bicarbonate, NaHCO3) is dissolved in a liter of pure water: a. The pH of the solution is 8.3. What is [HZCO§ ]? b. Strong acid is added until the pH is 3.5, at which point you may consider that essentially all of the carbonate system is present as HZCOg‘. If the water is then equilibrated with a very small gas volume, What is PCOZ, the partial pressure of carbon dioxide in the gas vol— ume? § 2 g 3 i x E z 3 z i i “E é y J 1, (7:9) aws) kwgflc, keg g3 3 /0 «$3 ~ _ ,. '"' “ gifgé I aim.“ m 1973’" ’ gm! “*1 , I! ah. E if W)gtcwwgfiéwmfiImi _ § I I I I __ 8%inqu ‘ ’5 220,125 _?¥me»i/¢ ‘ _ -3’3AMEOMS7 2:2 {0?jwfi/L, _ x * , aw; :mamwéwmg 30-41%??? * I (Milky/V3, it #55 ~mawéx] , a”? 1 _, E 340-”? MM 1: e '0 M» _ I I L Lay} [Twat ‘1 I H _ '7‘ y K: ; :5? I 10 : 5 gown;- [Hng K - . _ (o r __ _ _ v ? ;, ‘0' Cor 6WWM * ' _,E I ‘ ‘ 3;: ‘ ‘ "k ‘ - ' I; VEM _, i E E ‘ 1K4”? .769 _ 7 ,fi 6;, £5 ' gflfiméafl j _, ‘5; 1 :_.._;‘_ ...
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FT_Pset04_2008 - “Dibble/m Set #4 (HM/mm} [52“ wag)...

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