I need help on calculating ppm (parts per million) for my data. Chemistry 153 lo

Question

I need help on calculating ppm (parts per million) for my data.

Chemistry 153 lodern Experimental Chemistry Calculations For the standardization of Na,s,0, use the stoichiometry in equations t (15.3) and (15.4). To calculate the ppm Oz, use the stoichiometry in equations (15.1) and (15.2) to calculate the moles of oxygen, then convert from moles oxygen to ppm. Use 1000 g as the masso (since a 100.0 mL sample was measured, and the density of the solution is very nearly 1.00 gmL). In the procedure for the oxygen sample, 6 mL of various reagents were added to the original 400 mL sample. To correct for this (small) dilution factor, multiply the ppm O; by a factor of (406/400) = 1.0 15.

Explanation / Answer

ppm is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L).

1 ppm = 1 mg/L = 0.001 mg/mL = 0.001 g/L   (since 1L = 1000 mL & 1g = 1000 mg)

converting moles of oxygen to ppm: convert moles to mass in mg

moles = [mass of oxygen in g / molar mass of oxygen (31.9988 g/mol)]

mass of oxygen in g = ( moles x molar mass of oxygen (31.9988 g/mol)

now you got mass in grams let it be some 0.25 grams = 250 mg, next you have

100 g as mass of solution = 100 mL (since density is 1 g/mL) = 0.1 L

now interms of ppm it is = 250 mg / 0.1 L = 2500 ppm       (Since ppm = mg/L)

corrected ppm = 2500 ppm x 1.015

corrected ppm = 2537.5 ppm

Hope this helps you.

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