molarity

Molarity is the number of moles of solute per one liter of solution. The symbol for molarity is a capital M.

In chemistry, a solution is a mixture of two or more substances in which neither substance changes chemically. For example, salt water is a solution that contains water (the solvent) and salt (the solute). Concentration is the amount of dissolved substance in a solution. In other words, it is the amount of stuff that has been mixed into your liquid. Concentration is usually measured in molarity.

A mole is a basic unit in chemistry. It is the amount of a substance in grams that contains as many atoms, molecules, or ions as 12 grams of carbon-12 (6.022 x 1023) does. A mole of oxygen, for example, is 6.022 x 1023 atoms of oxygen.

Molarity is the number of moles of a solute per liter of solution. If we wanted to know the molarity of our saltwater solution, we’d want to know how many moles of salt are in every 1 liter of the water.

The first records of the term molarity come from around 1930. It combines the word molar, an adjective that refers to moles, and the suffix –ity, a suffix used to create abstract nouns that express a state.

Why do we care about molarity? Because it tells us how densely packed a substance is in a solution. Is there a lot of salt in the water or only a little bit? If you know the molarity of a solution, you can also determine the exact amount of substance (in grams) that is dissolved in a solution.

The actual metric unit of measurement of concentration is mole per cubic meter (mol/m3). Molarity is only concerned with a single liter, however, so we simplify the measurement by using mole per cubic decimeter (mol/dm3) instead. A cubic decimeter is equal to 1 liter.

A student will usually discover whether they will enjoy chemistry during the same lesson that their teacher introduces molarity.

I hate this review I hate chemistry I hate molarity. I HATE YOU! I can do like 3 on the front of this review I don't wanna look at the back

— Cole Jenkins (@Cole_Jenkins10) April 18, 2013

Shoutout to Ms. Shea for being a quality teacher because I'm one of the few in the class that understands how to calculate molarity.

— Milly (@millyborrellixo) September 4, 2015

• chemistry
• mole
• liter
• gram
• solution
• solvent

True or False?

Molarity is the number of moles of solute per one liter of solution.