chemistry! URGENT

A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 10.0 mg of fluoxymestrone in enough water to give a total volume of 500.0 ml. A 100.0 micro liter aliquot (portion)of this solution is diluted to a final volume of 100.0 ml. Calculate the concentration of the final solution in terms of molarity.

Please show all steps because I actually understand and learn how to do this. Thanks!

  1. 👍
  2. 👎
  3. 👁
  1. We need the molarity so we will need to be working in moles and therefore need the molar mass of the steroid.

    I make this
    C. 12 x 20 = 240
    H. 29 x 1 = 29
    F. 19 x 1 = 19
    O. 3 x 16 = 48

    total = 336 i.e. 336 g mol^-1

    If 10.0 mg is dissolved taken then this is

    0.0100 g /336 g mol^-1
    = 2.98 x 10^-5 mol

    If this is dissolved in 500 ml which is 0.500 L then the concentration is

    2.98 x 10^-5 mol / 0.500 L
    = 5.95 x 10^-5 M

    If 100 microlitre (0.100 ml) is diluted to 100 ml then this is a 1000x dilution (100 ml / 0.100 ml = 1000) so the final solution will be 1000 x more dilute. so

    5.95 x 10^-5 M /1000
    = 5.95 x 10^-8 M

    (please check the maths, and you will need to decide on the final sig figs, which will be 3 sig figs I think)

    1. 👍
    2. 👎
  2. Thank you! That was a giant help, I understand now!

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. CHEM

    Help on part "c": The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O. a)What is the molarity of the stock solution of luminol? anwer

  2. Chemistry

    A. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 13.0 g of luminol into a total volume of 75.0 mL of H2O. -What is the molarity of the stock solution of luminol? B. Before

  3. Chem 1

    The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0g of luminol into a total volume of 75.0 \rm mL of \rm H_2O. What is the molarity of the stock solution of luminol? 1.13M Before

  4. Chemistry

    The forensic technician at a crime scene has just prepared a luminol stock solution by adding 17.0 of luminol into a total volume of 75.0 of . What is the molarity of the stock solution of luminol?

  1. Chemistry

    The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that

  2. chemistry

    A stock solution of HNO3 is prepared and found to contain 11.1 M of HNO3. If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L, the concentration of the diluted solution is ________ M.

  3. chemistry

    A solution is prepared by dissolving 25.0 g of ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.0 mL sample of this stock solution is added to50.0 mL of water. Calculate the concentration of ammonium ions

  4. Chemistry

    The forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Luminol has a molecular

  1. Chemistry!!

    A chemist wants to prepare a stock solution of H2SO4 so that a sample of 20.00mL will produce a solution with a concentration of .50 M when added to 100.0mL of water. A)what should the molarity of the stock solution be? B)If the

  2. chemistry

    A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 13.4 mg of fluoxymesterone in enough water to give a total volume of 500.0 mL.

  3. chemistry

    how do i do this \? a 4.0mg/dl standard solution is needed. To prepare 100ml of the working standard. How much stock standard of a 1mg/ml (100mg/dl) solution is needed. i don't understand this conceptually / thanks

  4. CHEM

    Help on part "c": The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O. a)What is the molarity of the stock solution of luminol? answer

You can view more similar questions or ask a new question.