Re: conversion of moles% to ppm For gas/gas systems, density and molar mass don't really matter, as 1mol of ideal gas at 1atm and 0°C occupys 22.4L, and iteractions between gas molecules can be ignored at standard temps and pressures. Converter Parts Per Million (ppm) Parts Per Million (ppm) Converter for Gases. This converter calculates the measured value in units of ppm into units of mg/m 3 and visa versa. The unit ppm is used in several branches in different ways. The use of ppm therefore has to be specified in the input fields below, in the way it should convert the.
What are PPM and mg/L?PPM and mg/L are two different measures of substance concentration., or parts per million, is the number of parts of a substance in a million parts of the solution or mixture. For example, let's assume you want to measure the salinity of water. PPM is the number of salt parts per a million parts of the entire solution, both water and salt. mg/L, or milligrams per liter, is a measure of concentration. It states how many milligrams of the substance can be found in a liter of the or mixture. Converting between PPM and mg/LThe relation between PPM and mg/L is dependent on the solute density. Imagine that you add 10 grams of a substance to a liter of water.
If the substance is dense, like oil, it will have a smaller volume - and consequently, the solution will have a smaller PPM ratio. For substances of low density, for example alcohol, the PPM ratio will be much higher, even though the mg/L ratio stays constant.For converting PPM to mg/L, follow these steps:. Choose the solute - is the substance diluted with water, acetone or something else?
Let's choose oil with the density equal to 920 kg/m³. Determine the PPM value for your solution. Let's say you have created a solution with 1230 PPM of oil. Use the following formula to find the mg/L ratio:milligrams per liter = PPM. density / 1000. In this case,milligrams per liter = 1230.
![Da ppm a grammi Da ppm a grammi](http://w2.fop.unicamp.br/calculos/ppm_exa.jpg)
920 / 1000 = 1131.6 mg/LIt means that 1230 PPM is equivalent to 1131.6 mg/L of oil in water. Special case: waterAs you may know, the density of water is equal to 1000 kg/m³. It means that every cubic meter of water weighs 1000 kg. Let's recalculate the units:1000 kg/m³ = 1,000,000 g/m³ = 1,000,000,000 mg/m³ = 1,000,000 mg/dm³ = 1,000,000 mg/LThat means that every liter of water contains exactly a million milligrams of water. That means that if the substance dissolved in water has a density that is equal to or almost equal to the density of water, you can assume that 1 PPM = 1 mg/L.Remember that this equality is valid only for very specific conditions - pure water at a standard pressure and temperature. Calculating the molar concentrationIf you already know the mg/L ratio of your solution, you can also use this PPM to mg/L converter to calculate the. This parameter describes the number of moles in a liter of the solution and is expressed in molars (1 M = mol/L).To find the molarity, you need to know an additional parameter - the molar mass of your solute (substance dissolved in water).
It is expressed in grams per mole. Use the following formula:molarity = milligrams per liter / (molar mass. 1000)For example, oil has a molar mass equal to 900 g/mol.
We can use the previously calculated mg/L ration to determine the molarity:molarity = 1131.6 / (900. 1000) = 0.00126 M.