chem

posted by .

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

  • chem -

    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

  • chem -

    idkkkkkkkkkkkkk

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chem

    The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 (one million) parts of solution. Mathematically by mass: ppm = µg …
  2. Chemistry

    the density of a certain aqueous solution is 1.17g/ml, and the solution is 3.57% by mass NaOH. how many ml of this solution would you need to use in order to prepare 100.0 ml of .150 M NaOH solution?
  3. College General Chemistry

    How would you prepare each of the following solutions?
  4. chemisty lab

    determine the amounts of solute and solvent needed to prepare the following solutions. 2.0 M aqueous NaCl solution 1.0 m aqueous KCl solution 25% by mass aqueous MgCl2 solution
  5. chemistry

    determine the amounts of solute and solvent needed to prepare the following solutions. 2.0 M aqueous NaCl solution 1.0 m aqueous KCl solution 25% by mass aqueous MgCl2 solution
  6. chemistry

    PLEASE SHOW PROCEDURE! You wish to prepare an aqueous solution that has a freezing point of -0.100 degrees Celsius. How many milliliters of 12.0 M HCl would you use to prepare 250.0 mL of such a solution?
  7. chemistry

    n the spectroscopic analysis of many substances, a series of standard solutions of known concentration are measured to generate a calibration curve. How would you prepare standard solutions containing 10.0, 25.0, 50.0, 75.0, and 100. …
  8. Science, chem

    Develop a method to prepare 100 ml of 0.500mol/l aqueous CuSO4x5H2O solution. Include the water molecules that are hydrated to the crystals as given in the molecular formula, in your calculation of the molar mass. show all your calculations. …
  9. Chemistry

    Find the mass of urea (CH4N2O) needed to prepare 50.9 g of a solution in water in which the mole fraction of urea is 7.69×10−2.
  10. Chemistry

    We are asked to prepare a 100 ml solution with the following 3 concentrations: 53.00 mg/ml sodium salicylate, 0.020 M FeCl3, and 0.050 M HCl. Then, we are going to take the absorbance at 520 nm. What is the best way to prepare the …

More Similar Questions