Molarity and Dilution Calculations

Objective: Today I will be able to:

Calculate the molarity of a solution Calculate dilutions from a stock solution

Evaluation/Assessment: Informal Assessment – monitoring student questions

during the whiteboard practice problems and the dilutions practice

Formal Assessment – analyzing student responses to the exit ticket and dilution problems

Common Core Connection Make sense of problem and persevere in solving them Model with mathematics Look for and express regularity in repeated reasoning

Lesson Sequence Evaluate: Warm – Up Evaluate: Review HW Engage and Elaborate: Whiteboard Molarity

Problems Explain: Dilution Elaborate: Dilution Practice problems Evaluate: Exit Ticket

Warm - Up What is molarity? What is the formula for molarity? What do each of the symbols represent? How are grams converted to moles?

Objective Today I will be able to:

Calculate the molarity of a solution Calculate dilutions from a stock solution

Homework Finish Dilution Practice Problems

Agenda Warm-Up Review HW Molarity Whiteboard Problems Dilutions Notes Dilution Practice Problems Exit Ticket

Review HW

What questions do you have about the homework?

Molarity Whiteboard Problems

Directions Send 1 person up from your row to get each

person a whiteboard, a marker and an eraser Solve the problem Ms. Ose puts up on the

board Hold up your answer for Ms. Ose to check Erase! Repeat

Dilutions Notes

What is dilution? Small amount of solute, large amount of

solvent Less concentrated

Dilution In the laboratory we can make a more

concentrated solution become more dilute

M1V1 = M2V2

Stock solution – initial solution

Dilution Practice Problems

Complete the practice problems at your desk. If you have questions ask Ms. Ose. Problems not finished will become your homework.

Exit Ticket How would you prepare 1.5 L a 2.0 M solution

from a stock solution of 6.0M HCl?