2.5 Solutions and molarity

Exam 2

What is a solution?

A homogeneous mixture of a solute dissolved in a solvent.

What is molarity (M)?

Molarity = moles of solute / liters of solution

What are the units for molarity?

mol/L

What is the formula for molarity?

M = mol / L

How do you calculate moles from molarity and volume?

mol = M × L

A solution has 0.500 mol NaCl in 1.00 L of water. What is its molarity?

M = 0.500 mol / 1.00 L = 0.500 M

How many moles of NaCl are in 250 mL of 0.20 M NaCl?

mol = 0.20 × 0.250 = 0.050 mol