a) Calculate the molarity of a solution of Erythrosin B, (FD&C Red #3) (MW 879.9 g/mol)...
Calculate the molarity of a solution of FD&C Blue Dye No. 1 (MW 792.8g/mol) if a 0.5028-g sample is diluted to 100 ml in a volumetric flask and then two serial dilutions are carried out in which 5-mL aliquots are diluted to 100 mL using volumetric glassware.
Red food dye (FD&C Red 40, also known as allura red AC) has the formula C18H14N2Na2O8S2. 1. What is the molar mass of FD&C Red 40? To make a solution you take 0.0097 g of FD&C Red 40. 2. How many moles of FD&C Red 40 are in your sample? You dissolve the sample of FD&C Red 40 in enough water to make 250.0 mL of solution. We call this the stock solution. 3. What is the concentration of the...
A) A chemist prepares a solution by adding 304 mg of Co(NO3)2 (MW = 182.94 g/mol) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 100 mL. Determine the molarity of the prepared solution. B) Determine the mass of chloride (MW = 35.45 g/mol) in grams present in 100mL of a 0.289 M solution of aqueous FeCl3 (iron(III) chloride). C) A beaker contains 250 mL...
3. You dissolve the sample of FD&C Red 40 in enough water to make 250.0 mL of solution. We call this the stock solution What is the concentration of the stock solution in terms of molarity? 8.7x10-5 M You are correct. Your receipt no. is 156-2105 4. You make two dilutions. You take 87.60 mL of the stock solution and dilute to 500.0 mL to make Solution #1. You then add 65.28 mL of Solution 1 to 37.34 mL of...
Red Food Coloring Absorption Spectrum 1.000 0.800 0 600 0.400 0 200 400 450 500 Sso 600 650 3a. If the molar absorptivity constant at the optimum wavelength for the red dye solution is 5.56x104 M-lcm1, calculate the molarity of the red dye solution based on the absorbance value you obtained in question #2. You may assume L-1.22cm. Hint: A-ELC Molar mass of FD&C #3 = 879.86 g/mol b. Convert the molarity in part a to w/v00. Show your work....
2. Calculate the molarity of a solution made from 15.00 mL of 32.0 wt. % HCl stock (density of 1.161 g/mL) diluted to 100 mL in a volumetric flask. Calculate the spike volume of that 100 mL dilute solution needed to make 1.000 L of 1.25 x 10 ppm HCl solution.
Part B: A chemist prepares a solution by adding 415 mg of CoCl2 (MW = 129.84 g/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 100 mL. Determine the molarity of the prepared solution. (moles per litre, 3 sig figs) Part C: Determine the mass of chloride (MW = 35.45 g/mol ) in grams present in 100 mL of a 0.166 M solution...
A stock solution was prepared by dissolving 0.593 g of pure ASA (molar mass = 180.2 g/mol) with NaOH solution and diluting with water in a 1000 mL volumetric flask. This was followed by pipetting 4.00 mL of the stock solution into flask A and 5.0 mL of the stock into flask B. Flasks A and B were each diluted to 20 mL mark of the volumetric flask. What are the concentrations, in molarity, of ASA in flasks A and...
A chemist prepares a solution by adding 320 mg of K2Cr2O7 (MW = 294.19 g/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 750 mL . Determine the molarity of the prepared solution.
A chemist prepares a solution by adding 348 mg of K2Cr2O7 (MW = 294.19 g/mol) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 750 mL . Determine the molarity of the prepared solution. Express the concentration in moles per liter to three significant figures. ► View Available Hint(s) Templates Symbols undo redo 'reset keyboard shortcuts help concentration = mol/L Submit Previous Answers Determine the...