Pilocarpine across the corneal membrane of the eye


Assignment:

Transport of pilocarpine across the corneal membrane

Obtain the delta H and delta S in the example 3 - 14 on page 71 of Martin's Physical Pharmacy. A set of data (log Ka v. 1/T x 10^3) is plotted and the linear form of the van't hoff equation should be used to calculate delta H and delta S. The equation in this form is:
ln K = -(delta H/R)1/T + delta S/R or y = mx + b where: delta H/R = m and delta S/R = b.

Question-1

In the study of the transport of pilocarpine across the corneal membrane of the eye, Mitra and Mikkelson presented a van't Hoff

Problem        
    1/K'    pH
    0.2315    3.3
    0.2801    3.4
    0.4    3.6
    0.6993    3.9
    1.0526    4.11

714_linear.jpg

2 Anhydrous
ln/X 1/T
-1.1394 0.1
-0.9676 0.04
-0.6162 0.027

Did not convert to mole fraction first!

2 Dihydrate
ln/X 1/T

Question-2

Cg (g/L) π / cg (l-atm g-1)
1.25 7.76E-03
2.5 7.90E-03
3.75 8.03E-03
5 8.16E-03

312_Midterm.jpg

Question-3








C K 1/T log X X






Ibuprofen 75 348.15 0.002872 2.579784 380
Alclofenac 92 365.15 0.002739 2.875061 750
Ketoprofen 94 367.15 0.002724 2.845098 700
Fenclofenac 134 407.15 0.002456 2.146128 140
Diclofenac 155 428.15 0.002336 0.90309 8
Indomethicin 155 428.15 0.002336 -1 0.1
Naproxen 155 428.15 0.002336 1.845098 70
Sulidac 182 455.15 0.002197 1 10
Fenbuprofen 185 458.15 0.002183 0.69897 5
Indoprofen 213 486.15 0.002057 1.176091 15

75

348.15

0.002872

2.579784

380


92

365.15

0.002739

2.875061

750


94

367.15

0.002724

2.845098

700


134

407.15

0.002456

2.146128

140


110

383.15

0.00261

2.376577

238


155

428.15

0.002336

1.845098

70

?????

155

428.15

0.002336

0.90309

8


155

428.15

0.002336

-1

0.1


182

455.15

0.002197

1

10


185

458.15

0.002183

0.69897

5


213

486.15

0.002057

1.176091

15


75 348.15 0.002872 2.579784 380 206 2.313867
92 365.15 0.002739 2.875061 750 226 2.354108
94 367.15 0.002724 2.845098 700 254 2.404834
134 407.15 0.002456 2.146128 140 297 2.472756







110 383.15 0.00261 2.477121 300 305 2.4843

1866_Melting point solubility.jpg

Alpha-Methyls C K 1/T log X X
Indomethicin 155 428.15 0.002336 -1 0.1
Fenbuprofen 185 458.15 0.002183 0.69897 5
Indoprofen 213 486.15 0.002057 1.176091 15
Ketoprofen 94 367.15 0.002724 2.845098 700
Ibuprofen 75 348.15 0.002872 2.579784 380
Naproxen 155 428.15 0.002336 1.845098 70






Question-4

    1/T x 103    log Ka   
    3.47    -7.13   
    3.41    -6.97   
    3.35    -6.9   
    3.3    -6.8   
    3.24    -6.67   
    3.19    -6.53   
    3.14    -6.4   

2260_Log KA.jpg

In the study of the transport of pilocarpine across the corneal membrane of the eye, Mitra and Mikkelson presented a van't Hoff
plot of the log of the ionization constant, log Ka, of pilocarpine versus the recipocal of the absolute temperature, 1/T. Using the data in
Table 1 above, regress log Ka versus 1/T. With reference to the van't Hoff equation below :

                                                    ln K = - (delta Ho/R)1/T + deltaSo/R

obtain the standard heat (enthalpy), delta H, of inoization for pilocarpine and the standard entropy for the ionization
process.

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