■ What are the concentrations of the following solutions of drugs in g/100 mL (g %)? Calculate molar absorptivity and absorptivity) A) Carbimazole, A (1%,1 cm) value = 557, measured absorbance 0.557 using 1 cm cuvette at 291 nm. B) Hydrocortisone sodium phosphate, A (1%,1 cm) value 333, measured absorbance 0.666 using 1 cm cuvette at 248 nm. C) Isoprenaline, A (1%,1 cm) value = 0.500 using 1 cm cuvette at 280 nm. 100, measured absorbance

B 50ng/ml C500 ng/ml

Qd 56.

Caffeine (C8H10O2N4 • H2O) has an absorbance of 0.510 at 272 nm and 1 cm optical path in1 mg / 100 mL concentration solutions. A 2.5 g sample of soluble coffee is diluted withwater to 500 mL. Take 250 mL, add 25.0 mL of 0.1 N H2SO4 and dilute it to 500 mL. Theabsorbance at 272 nm resulting in 0.415. A) Calculate the grams of caffeine per kg of soluble coffee in the sample. Themolar mass of caffeine is 212 g / mol.

23 (H) Inorganic Analytical Chemistry CHEM 23 (H) FS-AY:20-21 Week 4-5: Quantitative Analysis by Gravimetry and Titration Quiz 4 My courses Exactly 24.69 mL of HCI is required to titrate a 278.0-mg sample of the tris(hydroxymethyl)aminomethane (MM: 121.14 g/mol), which is highly pure and free from absorbed water, according to the following balanced reaction: HOH -NH, + Cl" NH2 + HCl HO HO HO. HO. Calculate the molarity of the HCI solution. Answer: Next page gim

I did an experiment: Molar concentration of Fe (NO3)3=.002                                    Molar concentration of NaSCN= .002 On my 1st trial: Volume of Fe(NO3)3 = 5 mL Moles of Fe3+, initial (mol) = 1 x 10-5 Volume of NaSCN (mL)= 1 mL Moles of SCN-,initial (mol)= 2 x 10-6 Absorbance was .08 Now trying to find Calculation of Kc I already found [FeNCS2+] equilibrium, from calibration curve (mol/L)= 2.25 x 10-5 Now I need to know: 1. moles FeNCS2+ at equilibrium (10mL) (mol) 2. moles Fe3+, reacted (mol) 3. moles Fe3+, equilibrium (mol) 4. [Fe3+] equilibrium, unreacted, 10 mL (mol/L) 5. moles SCN-, reacted (mol) 6. Moles SCN-, equilibrium (mol) 7. [SCN-] equilibrium (unreacted) 10 mL (mol/L) Feel free to just give me the formula to find these. Or to charge me 2 or 3 questions if I asked too much.  Thank you!!!!!!

3:18 AM Wed Mar 1 Question 26 of 26 Calculate the [NH3] in a solution of 0.260 M ammonium cyanide (NH4CN). Hint: Use the Ka of HCN (4.9 x 10-¹0) and the Kb of NH3 (1.8 x 10-5) to calculate Kc for the reaction NH4+ (aq) + CN (aq) = NH3(aq) + HCN(aq). or pull up for additional resources

Macmillan Learning Suppose a student conducted an experiment similar to Experiment 3 using a green sports drink mix, preparing the solutions the same way. The green sports drink mix contains Yellow 5 dye and Blue 1 dye, but not Red 40 dye. At the Amax for the Yellow 5 dye, 420 nm, the student measured an absorbance of 0.187. At the Amax for the Blue 1 dye, 620 nm, the student measured an absorbance of 0.255. What is the concentration of the Yellow 5 dye and the concentration of the Blue 1 dye in the stock solution of the green sports drink?

20) 0,5 M H2S çözeltisindeki S2-(suda) derişimi nedir? H2S(suda) + H2O (s) HS (suda) + H2O (s) H3O+ (suda) + HS (suda) H3O+ (suda) + S²- (suda) Ka,1 = 1,0 x 10-7 Ka,2 = 1,0 x 10-19 A) 1,5 x 10-5 M B) 2,2 × 10-4 M C) 1,0 x 10-19 M D) 2,3 x 10-10 M E) 1,7 × 10-7 M

Rutile C Chec C Home Percer Answe Submit b Answe Submit Answer b Home O https://east.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator= assignment-take This question has multiple parts. Work all the parts to get the most points. b Ansvar °C [References] An aqueous solution containing 11.0 g of starch per liter has an osmotie pressure of 4.10 mm Hg at 25 °C. C Chego Blackb a what is the average molar mass of starch? (Because not all starch molecules are identical, the result,will be an average.). Molar mass= 49.860 X g/mol Try Another Version 2 item attempts remaining b what is the freezing point of the solution? (Assume that the molarity and molality are the same for this solution. Kp (H₂O) = -1.86 °C/m.) Freezing point = Conte OWX