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Solutions_to_Fundamentals_of_Spectrophotometr_Problem_Set_1

# Solutions_to_Fundamentals_of_Spectrophotometr_Problem_Set_1...

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Unformatted text preview: Chemistry 41 Fall 2003 Fundamentals of Spectrophotometry Problem Set 1. Deﬁne the following terms: frequency, wavenumber, monochromatic light, molar absorptivity and Beer’s law. 2. When does Beer’s law fail and why? 3. Why do we say that light has a dual nature? 4. List the regions of the electromagnetic spectrum in order of decreasing energy. 5. Calculate the absorbance of solutions which have the following percent transmittance (% T) values: (a) 75, (b) 52, (c) 10, (d) 4.1 and (e) 1.0. 6. Convert the following absorbance readings to percent transmittance (% T): (a) 0.005, (b) 0.23, (c) 0.48 (d) 1.00 and (e) 2.0. 7. A solution was found to have a 15.6 % transmittance at its wavelength of maximum absorption using a cell with a path length of 5.00 cm. Calculate the % T and absorbance of the solution in (a) a 10.00 cm and (b) a 1.0 cm cell. 8. A compound has a molar absorptivity W '1 at 7» = 395 nm. Calculate the molarity of a solution of this compound w c «s an absorbance of 0.425 when measuredina1.00cmcell. 3mu\d ha q)303 M'i €3,303 9. A solution contains 4.0 part per million (ppm) iron. The iron is reduced to the ferrous state and is complexed with 1,10-phenanthroline. The absorbance of the solution is measured at 508 nm in a 1.00 cm cell and found to be 0.795. Calculate the molar absorptivity of the ferrous-1,10-phenanthroline complex at this wavelength. 10. Green Slime, an uncharged organic dye, is present in a 600.0 mL sample of water at an unknown concentration. The sample is extracted with 75.00 mL of cyclohexane. After the extraction, the absorbance of the cyclohexane phase, measured at 635 nm in a 1.00 cm cell, is 0.870. The absorbance of a blank (pure cyclohexane) is 0.007. Molar absorptivity (8535) of Green Slime in cyclohexane = 68500 M‘1 cm‘1 Partition coefﬁcient (K) of Green Slime between cyclohexane and water = 32 a) Calculate the concentration of Green Slime in the cyclohexane phase after the extraction step. b) Calculate the concentration of Green Slime in the water sample prior to the extraction step. d) E; a 52:0 g/_ {32. )_ €543“ b277, g}; 77 A,” 01Man R ms}; , . ,- _ _ . _ equsgguaLmewﬁvVW, _ w 5, Y ,,.,_.;;£:, ,§,9b,3,,, ,, \$134M '- Qmﬂt O « \Q M_..__,-.--ih Siiziﬂayggw_ — pd: M“c_m“_ ,, M imthc/LJL )1 , _> ,, XS, 91333er1 c; . Pcu’ignlﬁllﬂw a- @091 HO. - l‘ 3 I f ':EAf‘:fm,bs.i&im}k¢\$YLg}gQ_ a) EFT“? MAM MSur if}. Q-, ﬁiAwmy"fiwﬂmﬁuiuﬂﬂggmh%ﬁhv:w g;'ﬁlmmdgglgﬁgﬁigaiﬁlQ£M%Agx} 1 ! f: e931 Q;::: i i: :i'f:"iii: @530.) gs: PS? chm 3x; if . (3331 ﬁ:¥::® ESQ” Mn— ";X " *Béeés m1 siqmuimﬁq mm? a q_q erg): erum , 9mm ’ Aha; e x: mpam g: ¥L¢_gc¢\‘gojk.,mﬁ 73‘}: “349 {c}; L» "A ,__\r\ Cmggaw 5M2 «30 {593431 (ﬁcﬁemﬁe? ‘ “mg:me om 2m;er ,Eabws mﬁhgﬁ I Q93 ELL 3; ..-gg§_§£ei:; ‘ up w m *"gx‘smgn mvaA-, NDQVNB W \R R CcnUzLﬁnAsga ~CLO20LLQQA‘ ‘W_A# I ChmeEl equLbnum -— _ H‘Ln ,- Map ,6? \vn'CJc A30 __ 3) .L; .h_é:fEi;qk nah; beak;ng CR3: duaan kit‘th urn ‘kﬁrmﬁ Ojt balih L...) QM wweéLég ﬁﬁkfsﬁmﬂﬂw , _ L w-u A ;_,-j-,—>;:..:_‘o: dj 5:; =3! IO; 59:] 583?; i W 2 “5‘35"” 2 we 7a p x 01:67; 2%, ji r l‘; ‘\_4) . - Q A abs «balls? ‘3 ,Am)[ in [:3 «3%: am )wﬁssusﬂl. ,, ,,5;ci_i:fc_;; , ,V .___ VT :7 f X=RbswbcwwW0~® 'P‘A‘H‘H’SS‘V‘QC "A‘A‘ﬁii * " i e, OZQT-LiLQ—Abméylc‘xi22‘43 s22, :th, f;i_ff; iii; ___——-—-’ ’Ii (moow‘mwdomig Q a t ,1; 4.57kxd5M 3| H =_ 4.0 ppm b: \- Clan _A_4_.%e%} 0.“) q 5 * i 0.7%: e59?) moomwxoggpga i ) ‘ 656%? WMJ Cmq .5 ‘if‘ Cm “ \gngL a: «was; W goers q’e; pg @, i la) (:3 * (0.5570-0‘m134995q: M‘igingme CGS 'f (cmmmje“11.;égxnxim, * r ,waé-E .. 39 bk .6: Yogi: A,b\qn,\£ 7. A w ,7 “VD ):< r ,, x ( “392% W‘i , S, \3 .eXﬁchC d, Ark; CYCbMKiﬂe. 7 7 3: \$1“.ch \g‘m MM DAL? " they, ,5“; gygfx’ggmgg.‘ ,, \ ; 7 «wwﬁwm 06 “\2 4* 9? 8mm S‘O’Xvﬁ, \ﬁics r ;b¢e.f\ EDHYLCA’LC} )ﬂk C\[Q\Q\~e\cc(\Q r , 39 4 (0.?ch homaé “mm 1 29x55 M)<75mL\ , , f .1} , , i T§YS\ mm; L, Xaxxg “393:5 ,, _ , ,7 7, 7 ,, 4;, N A 7” V ' 7 V N N 7 ' W in" A V v . “WW 77777777777777", H dd’mm’;ﬁ :ggmigm PM in 9d“ .7" ,:,::,m: N: ml (2g 7; pug ) m We. ,5 éi ,m ",777 W 7 ,7, , , WW ﬁvmimﬁ, ,ﬁ C_L7,2<,,,1;:MMM ._ , ,, # ...
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