Journal Entry:
 Supposed you wanted to determine if your tap water contains lead (II) nitrate, Pb(NO₃)₂, which is toxic. Do you expect the mass of 100 mL of pure water to be the same as that of a solution containing Pb(NO₃)₂? Explain your reasoning.

Learning Intentions

• We will learn how to explain the relationship between the mass of a solution sample and the molar mass of the solute

Closing Task:

You can determine the mass of solute in a solution.

Content Standards being covered:

Student understands what the letters and numbers stand for in a compound formula, can use those letter and numbers to determine how many of each type of element there are in a formula.

Student can create mathematical representations of chemical reactions and use them to make calculations about products and reactants.

Students can use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction. (HS-PS1-7 and CCC Energy and Matter)