Concentration? Not exactly.

Concentration Concentration can mean paying careful attention to what you are doing. But it also means how much of something there is in a mixture.

Concentration One way to talk about concentration is to use a percentage. The concentration of salt in seawater is about 3.5%. That means one kilogram of seawater contains about 35 grams of salt.

Concentration We can also use volume to talk about concentration. The concentration of acetic acid in vinegar is about 5%. That means in 100mL of vinegar, there are 5mL of acetic acid.

Concentration The number of atoms or molecules of a substance can often tell us more than mass or volume. Scientists use moles to tell the number of particles in a mixture.

Moles Moles? A mole is a number like a dozen. 1 dozen = 12 1 mole = 6.022x1023 1 mole of a substance is 6.022x1023 atoms or molecules of that substance. 1 mole of a substance has a mass equal to the atomic mass of the substance Moles?

Molarity Molarity is the number of moles in one liter of solution. A solution that contains one mole of solute per liter of solution is 1 Molar (1M). Molarity is the most common measure of concentration in science.

Preparing a Solution Measure out the required amount of solute. Add it to a small amount of water and stir to dissolve. Add water until the desired concentration is reached.