Question

The molar absorptivity of a dye is ε = 3.3 /M cm; what is the concentration...

The molar absorptivity of a dye is ε = 3.3 /M cm; what is the concentration of the solution (C) if the path length is given as ℓ = 1 cm and the absorption is A = 0.72? Beer-Lambert Law: A = εℓC SHOW WORK

(a) 0.33 M

(b) 1.4 M

(c) 0.22 M

(d) 0.72 M

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Assuming a molar absorptivity of 50,000 (Liters/mol cm) calculate what molarity you would need to get...
Assuming a molar absorptivity of 50,000 (Liters/mol cm) calculate what molarity you would need to get an absorbance of 1.0, using Beers Law. A =ε c l, where A is the absorbance; ε is the molar absorptivity in L/mol cm; c is the concentration in mol/liter; and l is the path length in cm, which, in our case, is 1.00 cm. Algebraically rearranging gives c = A/ε l =A/ε. B) Start with 20 mg of your dye. Calculate what morality...
The molar absorptivity, ε, for the dye called xylenol blue (C23H22O5S, molar mass = 410.49 g...
The molar absorptivity, ε, for the dye called xylenol blue (C23H22O5S, molar mass = 410.49 g mol-1) was found by experiment to be 8.15×103 L mol-1 cm-1 at 424 nm. The percent transmittance of a 960 mL solution of xylenol blue was determined to be 30.9%. If the path length of the cell is 2.19 cm, determine the mass (in g) of xylenol blue present in the solution. Report your answer to 3 significant figures in scientific notation.
Ergosterol, a precursor of vitamin D, has δmax = 282 nm and molar absorptivity ε =...
Ergosterol, a precursor of vitamin D, has δmax = 282 nm and molar absorptivity ε = 11,900 M-1cm-1. 1). What is the concentration of ergosterol in a solution whose absorbance A = 6.5×10-2 with a sample pathlength l = 1.00 cm. 2). What is the absorbance of a solution having a concentration of ergosterol of 5.2×10-5 M with a sample pathlength l = 1.00 cm?
a.If a solution of a compound that has a molar absorptivity 45 M–1 cm–1 placed in...
a.If a solution of a compound that has a molar absorptivity 45 M–1 cm–1 placed in a cuvette with a path length of 10 mm has an absorbance of 0.65, what is the molarity of the compound in solution? Show work. b. What would the value of the equilibrium constant be for the formation of FeNCS2+ from Fe3+ and SCN– , if the final equilibrium concentration of [FeNCS2+] = 7.84 x 10–3 M when the solution initially had [Fe3+] =...
Calculate the extinction coeffiction (ε, absorptivity) of each compound using Beer-Lambert's Law ; A = εbc....
Calculate the extinction coeffiction (ε, absorptivity) of each compound using Beer-Lambert's Law ; A = εbc. Because of the small amount of material used, you get 2 significant figures. A = absorbance ε = absorptivity b = path length (1 cm) c = concentration (moles/L) My masses were 1.9mg (1), 2.3mg (2) and 2.1mg (3). The MW were 572.53 (1) , 486.35 (2) and 512.39 (3) . The max wavelength were 483.5nm = 0.452 (1) , 583 nm = 0.772...
By Beer’s Law, determine the molar absorptivity of the iron (II) phenanthroline complex using maximum absorbance,...
By Beer’s Law, determine the molar absorptivity of the iron (II) phenanthroline complex using maximum absorbance, the molar concentration of the standard iron solution, and the cell path length. I'm confused because on this lab we have calculated the max Wavelenth (497nm) and used a spectroscopy instrument to measue the max Absorbance at that wavelength for the other samples and unknown. Beers law seem simple, But how would I use it to find the molar absorptivity? SAMPLE (in ppm) Max...
Given the absorbances and concentrations of NO2-, calculate the molar absorbtivity (cm-1?M-1)of this compound. Assume a...
Given the absorbances and concentrations of NO2-, calculate the molar absorbtivity (cm-1?M-1)of this compound. Assume a 1.00 cm path length. ( Hint: Need to construct a Beer's Law Graph) Concentration (?M) 200 100 50 25 15 10 Absorbance 1.13 0.58 0.31 0.14 0.1 0.05
The visible ultraviolet spectrum of a solution of concentration 9.9 x 10-5mol.L a hydroxy-1-naphthoquinone natural origin...
The visible ultraviolet spectrum of a solution of concentration 9.9 x 10-5mol.L a hydroxy-1-naphthoquinone natural origin was obtained in an optical path cuvette 1 cm. In the wavelength corresponding to 330nm, the compound showed absorbance equal to 0.320. To determine the concentration of a second solution of same compound was obtained in the same conditions, a spectrum in 330nm absorbance showed equal 0.480. In the conditions under which the spectra of the samples were obtained conform to the Lambert-Beer law....
Suppose 0.250 g of cobalt(II) chloride hexahydrate is dissolved in 50.0 mL of 4 M HCl,...
Suppose 0.250 g of cobalt(II) chloride hexahydrate is dissolved in 50.0 mL of 4 M HCl, and heated to 80oC in a cuvette having a 1.00-cm path length. At this temperature, the percent transmittance of the solution at 690 nm is measured to be 48.0%. What is the equilibrium concentration of CoCl42- in the solution? (Hint: use Beer's Law) a. 2.10 × 10-2 M b. 8.25 × 10-2 M c. 1.81 × 103 M d. 5.52 × 10-4 M What...
The first-order decomposition of a colored chemical species, X, into colorless products is monitored with a...
The first-order decomposition of a colored chemical species, X, into colorless products is monitored with a spectrophotometer by measuring changes in absorbance over time. Species X has a molar absorptivity constant of 5.00x103 cm–1M–1 and the path length of the cuvette containing the reaction mixture is 1.00 cm. The data from the experiment are given in the table below. [X] (M) Absorbance (A) Time (min) ? 0.600 0.0 4.00 x 10-5 0.200 35.0 3.00 x 10-5 0.150 44.2 1.50 x...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT