Analytical chem

posted by .

SPECTROPHOTOMETRIC ANALYSIS OF STEEL
I have a known molarity of KMnO4 solution. It was diluted by a factor of 20. Its absorbance is now 1.18. The length of the path is 1 cm.What is the molarity of the new solution.

  • Analytical chem -

    I think you need the molar absorptivity to solve, and I am not sure that the number that I supplied is the correct number. Chemistry research articles will report different numbers for it, and I know that it is not in CRC handbook. That is why Dr. Bob222 hasn't responded.


    Use the following equation:

    A=ebc

    Where

    e=molar absorptivity=1.80 x 104 M-1cm-1
    b=length of cuvette
    c=concentration (Molarity)
    A=absorbance


    Plug and Chug
    A/eb=c

  • Analytical chem -

    I apologize, this may be why he hasn't responded.

  • Analytical chem -

    I may be missing something but if you have a "known molarity" of KMnO4, then it's new concn is just M x 1/20 = ?

  • oops--Analytical chem -

    I goofed on the "English" part of my answer. It's should be its.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. AP Chem

    A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in …
  2. College Chemistry Lab

    Suppose that a 2.50x10^-6M solution of red dye No. 2 had an absorbance of 0.585 at its wavelength of maximum absorbance. A second solution of red dye No. 2 is too concentrated to read its absorbance so 5.00 mL of the concentrated dye …
  3. Food Analysis

    1.If 0.5l of 5M solution of CU(NO3) is diluted to a volume of 0.80l by adding water, what is the molarity of the resulting diluted solution?
  4. CHEMISTRY

    A STUDENT STUDYING THE FE+3- HSCN equilibrium put into a test tube 10.00ml of 2.00 x 10-3 M Fe(NO3)3 with 10.0 mL of 2.00 x 10-3 M HSCN.THE H+ in the resulting solution was manteined at 0.500.By spectrophotometric analysis of the equilibrium …
  5. Chemistry

    I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) = 6.386e-1 Molarity of Dye= 5.322e-3 Calculate the mass percent, molarity, molality and …
  6. chemistry

    A STUDENT STUDYING THE FE+3- HSCN equilibrium put into a test tube 10.00ml of 2.00 x 10-3 M Fe(NO3)3 with 10.0 mL of 2.00 x 10-3 M HSCN.THE H+ in the resulting solution was manteined at 0.500.By spectrophotometric analysis of the equilibrium …
  7. chem

    A student based the analysis of Cu(II) in a sample on the formation of the blue complex [Cu(H2O)6]+2. A standard solution was made when 1.276g of pure copper wire (MM= 63.546g/mol) was weighed, dissolved in concentrated HNO3, and diluted …
  8. Molarity

    A 4.0−L sample of a 6.3M NaCl solution is diluted to 50L . What is the molarity of the diluted solution?
  9. Chem

    If you have an equation for a line, y = 0.15x + 0.010, where y is absorbance and x is concentration in molarity of Fe (2+), calculate the concentration of a test sample with an absorbance of 0.065. What is the absorbance value for …
  10. Chem

    2. Suppose a chemistry student made 2000. mL of 6.00 M HCl. He accidently spilled half of this solution on the floor. What is the Molarity of HCL left in the beaker?

More Similar Questions