14. Figure 4.99 shows a graph of the percentage of drug dis- solved against time for four tetracycline products A, B, C, and D. Figure 4.100 shows the drug concentration curves for the same four tetracycline products." Discuss the effect of dissolution rate on peak concentration and time to reach peak concentration. % of drug dissolved 100 Dug A 80 Drug B DrugC 60 40 Drug D 20 t (minutes) 40 80 120 160 Figure 4.99

Methylethylketone (MEK) and water are partially miscible and hence form a mutually soluble two-phase system. R 298k, the MEK-rich layer contains 12% water and the water rich layer contains 25% MEK. If 100 kg each of water and MEK are mixed at 298K and allowed to reach equilibrium.• Calculate the weight of the MEK layer • Calculate the weight of the water layer

SOLVE STEP BY STEP DONT USE CHAT GPT In a laboratory, thymol blue (T) will be quantified using a calibration curve. To do this, a Stock solution of thymol blue Cstock =6 10^-5 M dissolved in 1 M HCI is prepared. From this solution, 5 systems are prepared (gauged with 1 M HCI), whose absorbance is read at 455 m, obtaining the following data: On the other hand, 2 mL was taken from a test solution and made up to 10 mL with 1 M HCI (solution A). Of this, 3 mL were taken and They made up to 10 mL with HCl (solution B). System B 1 Vstock (ml) 01 Vsoln B (ml) 00 Capacity (ml) 10/10 Absorbance 00.3512 T(M) 2 2 10 10 0.697 3 3 10 10 1.043 4 4 10 10 1.388 Determine the concentration of the test sample in system 6 Determine the concentration of thymol blue in the sample 5 5 lo 10 1.734 6 10 Fill in the table above with the concentrations of thymol blue in each of the systems on the curve. (7 decimal places) Based on the thymol blue concentrations in the calibration curve, determine the linear…

3) A random poly(styrene-butadiene) copolymer has a number-average molecular weight of 350,000 g/mol and a degree of polymerization of 5000. Compute the fraction of styrene and butadiene repeat units in this copolymer.