[PDF] concentration molaire h2o

What is molar concentration?

Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.

What is the molarity of a solution?

A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M. Molarity is often depicted with square brackets around the substance of interest, for example the molarity of the hydrogen ion is depicted as [H+].

How do chemists use molarity?

Use molarity to determine quantities in chemical reactions. Use molarity as a conversion factor in calculations. Another way of expressing concentration is to give the number of moles of solute per unit volume of solution. Of all the quantitative measures of concentration, molarity is the one used most frequently by chemists.

How do you calculate molarity of HCl?

Step 1: First, convert the mass of solute to moles using the molar mass of HCl (36.5 g/mol): 22.4 gHCl × 1molHCl 36.5 gHCl = 0.614mol HCl 22.4 g H C l × 1 m o l H C l 36.5 g H C l = 0.614 m o l H C l Step 2: Now we can use the definition of molarity to determine a concentration: