Understanding Solution Concentrations

Dr. English introduces solution chemistry, focusing on solution concentration methods: molarity, percent by mass, percent by volume, and parts per million. Each method is explained with examples, demonstrating how to calculate concentrations in different scenarios. The video concludes with a summary and contact information for further assistance.

What is the main focus of the video tutorial?

• Atomic structure

• Solution concentration

• Chemical reactions

• Periodic table

How is molarity defined?

• Moles of solute per liter of solution

• Grams of solute per liter of solution

• Moles of solute per gram of solvent

• Grams of solute per gram of solvent

In the molarity example, what is the first step to find the molarity of a solution?

• Measure the volume of the solution

• Calculate the density of the solution

• Convert mass to moles

• Add solute and solvent masses

What is the formula for percent by mass?

• Moles of solute over liters of solution times 100

• Grams of solute over liters of solution times 100

• Moles of solute over total moles of solution times 100

• Grams of solute over total grams of solution times 100

In the percent by mass example, what is the total mass of the solution?

• 220 grams

• 200 grams

• 20 grams

• 240 grams

What does percent by volume measure?

• Concentration of a liquid in a solution

• Concentration of a solute in a solvent

• Concentration of a solid in a solution

• Concentration of a gas in a solution

In the percent by volume example, what is the total volume of the solution?

• 5 milliliters

• 110 milliliters

• 100 milliliters

• 105 milliliters

What is parts per million used for?

• Concentrations of very dilute solutions

• Concentrations of concentrated solutions

• Concentrations of solid solutions

• Concentrations of gaseous solutions

In the parts per million example, what is the concentration of PCBs in the water?

• 50 parts per million

• 150 parts per million

• 100 parts per million

• 200 parts per million

What should you do if a problem is given in kilograms when calculating parts per million?

• Convert kilograms to milliliters

• Convert kilograms to moles

• Convert kilograms to liters

• Convert kilograms to grams