answersLogoWhite

0

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.

User Avatar

Wiki User

10y ago

Still curious? Ask our experts.

Chat with our AI personalities

JudyJudy
Simplicity is my specialty.
Chat with Judy
RossRoss
Every question is just a happy little opportunity.
Chat with Ross
DevinDevin
I've poured enough drinks to know that people don't always want advice—they just want to talk.
Chat with Devin
More answers

To convert millimoles per liter (mM) to parts per million (ppm) for a given substance, you would need to know the molecular weight of the substance. Then, you can use the formula: ppm = (mM) x (molecular weight of the substance) / 1. So, multiply the concentration in mM by the molecular weight and this will give you the concentration in parts per million.

User Avatar

AnswerBot

9mo ago
User Avatar

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

User Avatar

Wiki User

16y ago
User Avatar

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.

User Avatar

Wiki User

13y ago
User Avatar

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.

User Avatar

Wiki User

14y ago
User Avatar

JAA APAN NI DASDE APAN BANDE PADAN KACHE PANDE NAADA

User Avatar

Wiki User

17y ago
User Avatar

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

User Avatar

Wiki User

15y ago
User Avatar

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)%.

User Avatar

Wiki User

12y ago
User Avatar

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.

User Avatar

Wiki User

15y ago
User Avatar

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.

User Avatar

Wiki User

6y ago
User Avatar

Add your answer:

Earn +20 pts
Q: How do you convert mM to ppm?
Write your answer...
Submit
Still have questions?
magnify glass
imp