How do you convert mM to ppm?

Answer 1

To convert parts per million to millimoles, there are 1,000 liters of water per 1,000,000 grams. Therefore, 20 grams divided by 35.453 grams per millimoles is equivalent to 1.66 x 10 raised to negative 15 millimoles.

Answer 2

M is moles per litre, ppm is parts per million, or mg/litre

so take molarity as no. of moles. use the gram molecular weight.

use formula no. moles = mass/gmm. that finds the mass in grams. multiply by 1000 to convert to milligrams, or ppm.

eg1M HCl. GMM HCl is 1+35.5=36.5

no moles = 1.

Moles x gmm = grams

36.5 x 1 = 36.5 g / litre.

x 1000 = 36500ppm

Answer 3

To convert mM to ppm, multiply the concentration in mM by the molecular weight of the solute. For 1mM CaCl2, it works out to 110.9ppm. The expanded math is below:

1mM CaCl2 = 0.001mol/L

Formula wt = 110.9 g/mol

0.001mol/L x 110.9g/mol = 0.1109g = 110.9mg

Since mg/L = ppm,

110.9mg/L = 110.9ppm

Hope this helps.

Answer 4

ppm is usually a molar ratio: 1 mole substance per 1x106 moles of total solution.

mg/L (milligrams/liter) is more often used for liquid solutions

pH is related to the molar concentration of the H+ ion in a solution in moles/liter. The pH value is the negative logarithm of the moles H+ concentration in a liter of the solution.

So we have several interacting concentration, volume and mass measures in play.

Let's assume a pH of 5 as our test case.

This means there are 1x10-5 moles of H+ in one liter of the solution. At this low concentration the mass of the solution will not be much different fom water, so the solution has mass of 1000 grams or 1,000,000 milligrams.

H+ has a molar mass of 1 gram/mole or 0.00001 gram per 10-5 mole.

So a weight ppm value of the H+ ion in the solution is 10-5 g/liter (or 1 million milligrams). Converting g to mg we arrive at the answer that a pH contains 10-2 ppmw of H+.

However if the ppm is to indicate the ppm value of the acid contributing the H+ ions it is necessary to change the molar mass of H+ to the molar mass of the acid (you have to know what acid is present).

Using H2SO4 as an example, the molar mass is 98 g/mole and each mole

contributes 2 moles of H+ to the solution. There would be (98/2)x 10-5 ppmw (or (49x 10-5 ppmw)of H2SO4 in the solution.

Answer 5

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Answer 6

You don't. They have to do with different types of measurements.

Answer 7

Divide by 10,000. Ppm is an abbreviation for parts per million, so

X parts/million * million/10,000 hundred = (X/10,000) parts/hundred = (X/10,000)%.

Answer 8

You must know the molecular weight to perform this calculation; parts per million is almost always measured in terms of mass/weight, not mole fraction.

Answer 9

Molarity is expressed in kg/m3 or g/L; 1 g = 10e6 μg.
1μg/L is 1 ppm.
But it is not practical to express molar mass in μg.

Answer 10

sulphur (32 g/mole)

pH = 7.16

pH in ppm ?