Understanding Molarity and Solution Concentration

What is the molarity of a solution made from 86.5 g Ca(OH)₂ in 200.0 mL water?

(a)  

How can the molarity of a solution be determined if the mass of the solute is known?

• By converting the mass of the solute to moles and dividing by the volume of the solution

• By diluting the solution to a known volume

• By freezing the solution and measuring its volume

• By measuring the density of the solution

What is the purpose of dilution in the context of solutions?

• To change the chemical properties of the solute

• To reduce the concentration by increasing the volume of the solvent

• To decrease the volume of the solvent

• To increase the concentration of the solute

What does molarity measure in a solution?

• The number of moles of solute per liter of solvent

• The weight of the solute in grams

• The density of the solution

• The volume of the solvent in liters

Which equation is used to calculate the new concentration after dilution?

• C₁V₁ = C₂V₂

• M₁V₁ = M₂V₂

• D₁V₁ = D₂V₂

• P₁V₁ = P₂V₂

Tags

NGSS.HS-PS1-7

What happens to the concentration of a solution if the volume is doubled?

• The concentration is halved

• The concentration is quadrupled

• The concentration is doubled

• The concentration remains the same

To what volume, in mL, does the solution above need to be diluted to make the concentration 1.95 M?

(a)  

A student needs to prepare of a 500.0 mL of a 0.150 M copper(II) sulfate solution by diluting a stock solution. If the stock solution must be diluted by a factor of 10 ( 10 x dilution), what mass (in grams) of solid copper(II) sulfate is required to prepare the original stock solution?

​ ​ (a)