What is the concentration of the nitrogen in ppm if 1.3 mg is found in 2500 kg of soil?

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13. A The concentration of dissolved iron(II) ions, Fet(aq), in a sample of ground water is 7.2 X 10-5 mol/L. Is this concentration an acceptable level if the recommended maximum level is 300 ppb? Show your work, and explain your reasoning: 14. TII A pharmacist dilutes a 10% (mlv) saline solution until the final volume is four times the initial volume. Find the molar concentration of sodium chloride in the diluted solution:

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This is another way of determining concentration. This is used for very small concentrations of particles in solutions.

think about this;  1ppm = 1 inch in 16 miles

As for solution ppms:

This is really just a plug and chug problem.

What is the concentration of a solution, in parts per million, if 0.02 gram of NaCl is dissolved in 1000. grams of solution?

Then June 2007, New York State threw this curveball. Most students lost 1 of the 2 points on this one.

66. An aqueous solution has 0.0070 gram of oxygen dissolved in 1000. grams of water. In the space

Answer-The equation above reads "grams of solution", you had to add the solute to the solvent in the denominator. Even though mathematically it didn't change a thing. It is technically wrong not to add the solute and solvents together to determine the mass of solution.

YOU HAVE BEEN WARNED

Here was another one, but it was a multiple choice.

Jan 2006- 39.  If 0.025 gram of Pb(NO3)2 is dissolved in 100. grams of H2O, what is the concentration of the resulting solution, in parts per million?
(1) 2.5 × 10–4 ppm   (2) 2.5 ppm      (3) 250 ppm     (4) 4.0 × 103 ppm

And another..and another..and yet another.

June 2005-42 What is the concentration of a solution, in parts per million, if 0.02 gram of Na3PO4 is dissolved in 1000 grams of water?
(1) 20 ppm     (2) 2 ppm   (3) 0.2 ppm  (4) 0.02 ppm

June 2008-38 What is the concentration of O2(g), in parts per million, in a solution that contains 0.008 gram of O2(g) dissolved in 1000. grams of H2O(l)?
(1) 0.8 ppm    (2) 8 ppm   (3) 80 ppm  (4) 800 ppm

June 2009-36 What is the total mass of solute in 1000. grams of a solution having a concentration of 5 parts per million?
(1) 0.005 g    (2) 0.05 g   (3) 0.5 g    (4) 5 g

Jan 2008-

38 What is the concentration of O2(g), in parts per million, in a solution that contains 0.008 gram of O2(g) dissolved in 1000. grams of H2O(l)?(1) 0.8 ppm    (3) 80 ppm

(2) 8 ppm       (4) 800 ppm

Aug 2010-

15 Which unit can be used to express the concentration of a solution?(1) L/s   (3) ppm

(2) J/g    (4) kPa

on to Molality  or  Colligative Properties

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"\\begin{aligned}\nmass\\ of\\ selenium &= 1.3mg = 1.3\u00d7 10^{-3}g\\\\\nmass\\ of\\ soil &= 2500kg = 2.5\u00d710^6g\\\\\n\\\\\nppm\\ of\\ selenium &= \\dfrac{mass\\ of\\ selenium(g)}{mass\\ of\\ soil(g)}\u00d7 10^6\\\\\n\\\\\n&= \\dfrac{1.3\u00d7 10^{-3}g}{2.5\u00d710^6g}\u00d7 10^6\\\\\n\\\\\n&= 0.52 \u00d7 10^{-9} \u00d7 10^6\\\\\n&= 5.2\u00d7 10^{-4}ppm\\\\\n&=0.00052ppm\n\\end{aligned}" "\\therefore" The concentration in ppm of selenium is 0.00052ppm