U14: Day 2 Notes Concentration

What does molarity measure in a solution?

• The total weight of the solution

• The number of moles of solute per liter of solution

• The amount of solvent in a solution

• The temperature of the solution

What is the first step in preparing a 0.5 molar solution?

• Heat the solution

• Add 0.5 moles of solute to a volumetric flask

• Stir the solution

• Add 0.5 liters of solvent

How do you calculate the molarity of a solution?

• Divide the volume by the number of moles

• Add the moles and the volume

• Multiply the moles by the volume

• Divide the number of moles by the volume

If you have a 1.08 molar solution, how do you find the volume needed for 0.642 moles?

• Multiply 1.08 by 0.642

• Divide 0.642 by 1.08

• Subtract 0.642 from 1.08

• Add 1.08 and 0.642

What is the final step in calculating the mass of a solute in a solution?

• Divide the molar mass by the number of moles

• Add the molar mass to the number of moles

• Find the molar mass and multiply by the number of moles

• Subtract the number of moles from the molar mass