general chemistry II

Phosphoric Acid is usually obtained at an 85% phosphoric acid solution, by mass. If this solution is 15 M, what is the density of the solution? What is its MOLALITY?

  1. 👍 0
  2. 👎 0
  3. 👁 361
asked by JL
  1. Assume 1000 grams of solution.
    then you have 850 grams phosphoric acid, and 150 grams of water.

    15M=850/molmassH3PO4 / volumeinL

    solve for volume, = 850/(molmass*15), figure molmass, then calculate volume.
    finally, density= masssoluton/volumeL=
    = 1000g/volumeL figured above
    you may want to change that to g/ml

    1. 👍 0
    2. 👎 0
  2. density x 1000 mL x %H3PO4 x (1/molar mass) = 15M
    Solve for density = approximately 1.7 but you need to do it more accurately.

    mass of 1000 mL = 1.73 x 1000 mL = 1730 g
    mass H3PO4 = 1730 x 0.85 = 1470g
    g solvent = 1730g-1470 = 260g
    m = mols solute/kg solvent/kg solvent = 15/0.260 = about 57m.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    Concentrated phosphoric acid is 90% by mass and the remaining mass is water.The molarity of phosphoric acid in 90% is 12.2M at rtp. a)What is the density of the solution at rtp ? b)What volume (in mL)of this solution is needed to

    asked by Joseph on November 11, 2015
  2. Chemistry

    Givien a 2.0kg solution of phosphoric acid and water 53% phosphoric acid by mass calculate the number of moles of phosphoric acid

    asked by Anonymous on October 14, 2011
  3. Chemistry

    Givien a 2.0kg solution of phosphoric acid and water 53% phosphoric acid by mass calculate the number of moles of phosphoric acid

    asked by Anonymous on October 14, 2011
  4. College Chemistry

    Phosphoric Acid is usually obtained at an 85% phosphoric acid solution, by mass. If this solution is 15 M, what is the density of the solution? Express your answer in g/ml

    asked by Tabatha on September 14, 2010
  5. Chemistry

    I am using 85% ACS grade phosphoric acid. I need to make a 21% phosphoric acid solution with a total volume of 250ml. I have been told that 37ml of the 85% ACS grade phosphoric acid plus 188ml of Deionized water will create the

    asked by Melissa on December 9, 2016
  6. Chemistry

    Given a 2.5 kg solution of phosphoric acid and water (56 % phophoric acid, by mass), calculate the number of moles of phosphoric acid.

    asked by Emily on October 18, 2010
  7. chemistry

    Concentrated phosphoric acid,H3PO4 was added slowly into some water to produce 5.0dm^3 of a dilute acid solution.100g of the pure phosphoric acid,H3PO4 was present in the solution.Find the concentration of the acid,in g dm^-3.

    asked by mandy on May 5, 2014
  8. chemistry

    3ca(s) + 2H3PO4(aq) -> Ca3(PO4)2(aq)+3H2(g) 1)a reaction between calcium and a solution of 1.2moldm-3 phosphoric acid produced 3 mol of H2 gas. a) Minimum volume of phosphoric acid would have been needed for reaction: I got 1.6cm3

    asked by 0ooooooooo0 on September 28, 2017
  9. chemistry

    Calculate the molarity of a phosphoric acid(H3PO3)solution that is 84% by mass phosphoric acid and has a density of 1.87g/mL.?

    asked by Lahna on July 2, 2011
  10. Chemistry

    A solution of .12 mol/L of phosphoric acid completely neutralizes .20L of a solution of sodium hydroxide with.a concentration of .15mol/L What is the neutralizing volume of the phosphoric acid?

    asked by Kelly on April 27, 2012

More Similar Questions