1. Questions

chem

How would u prepare each of the following solutions

100 mL of a 245 ppm solution of urea, CH4N2O, in water

and
How would u prepare each of the following solution

100 mL of an aqueous solution whose K+ concentration is 0.084 M


Write up the procedure, and I will gladly check it. I assume the ppm is on the basis of w/w

  1. 👍
  2. 👎
  3. 👁
UTramos

  1. MW:CH4N2O(Urea) 60g/mole x 245/1000000 x .100L = .00147g urea. So weigh out .00147g urea and mix it with water in a volumetric flask up to exactly 100mL. Since 1ppm =1mg/1kg or 1/1000000

    1. 👍
    2. 👎
    regina

  2. idkkkkkkkkkkkkk

    1. 👍
    2. 👎
    ste

Respond to this Question

First Name

Your Response

Similar Questions

  1. chem

    A 4.55L sample of water contains .115g of sodium ions. Determine the concentration of sodium ions in ppm if the density of the solutions is 1.00g/mL. Ok so ppm=mass of solute/mass of solution *10^-6 so we have the mass of the

  2. ALGEBRA CHECK ANSWERS

    Solve each equation by graphing the related function. If the equation has no real-number solution, write no solution. NOTE: when I write + it has a minus on the bottom too x^2+7=0 a. x= +7 b. x = +3.5 c. x= 0 d. no solution ***

  3. Chemistry

    You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 250ml of 2.00M H2SO4 solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom

  4. Chemistry

    Carbon dioxide gas has a solubility of 0.0972 g/100 g H2O at 40 degrees celsius. Expressed in parts per million, this concentration is closest to... (1)0.972 ppm (2)9.72 ppm (3)97.2 ppm (4)972 ppm

  1. chemistry

    Prepare 100ml of 2.50M HCl solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom Explorer. You will find a 2.50 liter bottle containing 11.6M HCl. Please prepare a flask containing

  2. Chemistry

    0.000333 g fluorescein (332.32 g/mol) is dissolved in 225 mL solution of ethanol. The density of ethanol is 0.785 g/mL. What is the concentration of the solution in molarity (M)? How many ppm? I already know that the molarity is

  3. Chemistry

    If we want to prepare 125 mL of a 1.245 M aqueous KCl solution, how many grams of KCl (rounded with correct number of significant figures) would we need to put in the solution?

  4. chemistry

    Calculate the grams or milliliters of solute needed to prepare the following solutions. 1.)75. g of a 7.0 % (m/m) KCl solution 2.) 1250 mL of a 8.0 % (m/v) NH4Cl solution 3.) 270. mL of a 15.0 % (v/v) acetic acid solution I really

  1. Chemistry

    If we want to prepare 125 mL of a 1.245 M aqueous KCl solution from a 7.134 M aqueous KCl solution, how many mL of the 7.134 M solution (rounded with correct number of significant figures) will we need to put in the new solution?

  2. chemistry

    You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 1000ml of 3.00M NaOH solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom

  3. 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

  4. Chemistry

    You have to prepare a pH 3.50 buffer, and you have the following 0.10M solutions available HCOOH, CH3COOH, H3PO4,CHOONa, CH3COONa, and NaH2PO4. a) What solutions would you use? b) How many milliliters of each solution would you

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