What is ppm, and what does it have to do with molarity? In this article, we’re going to unpack both of these terms so that you can understand how they relate to each other. We’ll also explain how you can convert between ppm and molarity using a simple equation.

## What are ppm and molarity?

PPM stands for “parts per million,” and is one of the most common ways of measuring concentrations in water. In other words, it’s a way to determine how many molecules of a substance are present in each volume of water. If your solution contains 1 ppm copper sulfate, you’d find about one copper-containing molecule for every million water molecules in your solution.

Molarity is a unit of concentration. It is defined as the number of moles of solute per liter of solution. The symbol for molarity is M, and it’s usually written as M or [M], depending on who you ask.

The units for molarity are mol dm-3 (or mol L-1). In other words, each unit represents one mole per liter. So if you have 1 mol dm-3 of water (H2O), that means there are 1 mole H2O dissolved in every 1000 mLs of water: 1 mmol kg/mol = 0.001 mol/kg = 0x10^{6} mol/m^3 = 10^6 ppm

## A technical definition of ppm

In chemistry, the term “parts per million” or ppm refer to a unit of measurement that measures the concentration of one substance within another substance. It is used to differentiate between parts of one substance in millions of other substances.

PPM is a measure of concentration that can be applied to both liquids and gases. When it comes to water, however, most people are more familiar with its use in measuring concentrations like acidity and alkalinity (or pH).

## How to convert ppm to molarity? – the ppm to molarity calculator

Enter the ppm value in the first box, and the molar mass in the second box and click on “Convert.” The result will appear in molarity.

To use this ppm to molarity calculator to convert from ppm to molarity, you can enter your desired concentration in parts per million (ppm) into the first box and click on “Convert.” This will automatically calculate and display your answer in millimoles per liter (mM).

To use this ppm to molarity calculator for reverse conversions, you can enter your desired concentration in millimoles per liter (mM) into the first box and click on “Convert.” This will automatically calculate and display your answer as parts per million (ppm).

For more information on this topic, you can check out our Molarity Calculator.

## FAQ

### What is molarity?

Molarity (M) is the amount of a substance in a certain volume of solution.

### What is a mole vs molarity?

Mole is a measurement of the number of substances, whereas molarity is a measurement of concentration.

### What is the difference between molarity and concentration?

Concentration is the ratio of the amount of solute per amount of solution. Molarity is a unit of concentration that specifically relates to the number of moles of a solute per liter of solution.