Calculate the concentration of CoCl42- if the absorbance of its solution in a 1 cm cell is 0.794. Use the pertinent data from the lab procedures.
Calculate the concentration of CoCl42- if the absorbance of its solution in a 1 cm cell...
QUESTION 5 The initial concentration of Ci1- is 0.100M and the initial concentration of Co(H206+ is 0.0 M. At equilibrium the concentration of Coci42-is 0.00443. What is the value of the equilibrium constant for the reaction being studied? QUESTION 6 Calculate the concentration of Coci42- if the absorbance of its solution in a 1 cm cell is 0.416. Use the pertinent data from the lab procedures. QUESTION7 Calculate AG On k) at 35.4°c for a reaction that has Keg 106
Assume the molar absorptivity (ε) for CoCl42- at 700 nm is 412.2 M-1 cm-1. If d, the cell path length, is equal to 0.85 cm for the cuvettes being used, and if the measured absorbance (A) at 700 nm is 1.305, what is [CoCl42-]? Express your response to four digits after the decimal.
3. A 2.50x10-M solution of a dye has an absorbance of 0.520 when measured in a 1.00 cm cell at 625 nm. Calculate the %Transmittance of the solution. Will the %Transmittance increase or decrease if the concentration of the dye is increased. CamScanner
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...
Using a 1.00 cm cell, a student measures the absorption of a 0.050M solution. The absorbance at a wavelength of 480nm was 1.500. Calculate the molar absorptivity coefficient and express it with its units.
A student measures the absorbance of a solution at some point during the reaction and records a value of 0.335 . (Note that absorbance has no units.) Use Beer's Law and the constants given on page 5 to calculate the concentration of crystal violet in this solution. *The relationship between the solution absorbance and the CV+ concentration can be written as shown in Equation 7 below (Beer’s Law). At = ε∙b∙ct [7] In Equation 7, At is the reaction solution...
Page 9 Questions 1. A substance exhibits an absorbance of 0.47 in a 1.00 cm cell at 525 nm. (a) What will be its absorbance in a 2.7 cm cell? (b) If the substance concentration is 2.1 x 10-5 mol dm, compute its molar absorptivity. (c) What absorbance will it have in a 5.0 cm cell at 2. = 405 nm (think about it!)? 2. You are setting up an absorption spectrometer to determine the concentration of a gas which...
2. The absorbance of a 2.31 % 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm. The following absorption data were calculated in an experiment: Absorbance 0.000 0.00 0.181 0.271 0.361 0.450 0.539 0.627 0.7 Concentration 0.000 1x10-3 2x10-3 3x10-3 4x10- 5x10- 6x10 3 7x10- 8x1 (M) Plot Absorbance vs. Concentration and a) calculate the molar absorptivity coefficient from the slope if the...
cell. Calculate the %Ts Problem 2 A105 10M solution of a dye has an absorbance of 0.462 at 590 nm in a 2.50 cm cell. Calculate the 9%T Problem 3 Calculate the molar absorptivity (a) of the dye in problem 2.
a solution of an analyte is placed in a 1.00 sample cell and has an absorbance of 0.228 when measured at a wavelength of 490 nm.its molar absorptivity is 676. what is the concentration of the analyte of l/(mol cm)