Concentration Calculations
Presentation
•
Chemistry
•
9th - 12th Grade
•
Hard
Standards-aligned
Raechel Mendelsohn
Used 6+ times
FREE Resource
13 Slides • 7 Questions
1
Concentration Calculations
Working through the steps
2
Why is Ms. Mendelsohn making us do these calculations!?!?!
The perfect cup of coffee (or tea) is very important. Which the next video to learn what coffee has to do with it.
3
4
Working through a word problem
Get out your science notebook and something to write with.
5
Pb(NO3)2 + NaOH -> ions and a ppt
Complete the chemical equation
6
Multiple Choice
What were your products?
NO3- + Na+ + Pb(OH)2
NO3- + Na+ + PbOH
NaNO3 + Pb(OH)2
7
You are informed that 42 mg of Pb(OH)2 precipitate formed, calculate the starting molarity of Pb(NO3)2 in 50 mL of solution.
What is this telling us?
We have 42 mg of solid Pb(OH)2 formed in a 50 mL solution
This is a concentration of mg/mL
We need to find the number of moles in the 50 mL
8
42 mg of Pb(NO3)2 needs to be converted to something usable. Remember our goal is moles.
How will we do this?
9
Multiple Choice
To convert your 42 mg of Pb(NO3)2 to moles, you should first convert your mg to g. What is the correct set-up?
42 mg ×1000 mg1 g
100042
42 ×1000
10
Now look back at your original equation.
Pb(NO3)2 + NaOH -> ions and a ppt.
We have 42 mg Pb(NO3)2.
What is the amount of Pb(NO3)2 in grams?
11
Fill in the Blanks
Type answer...
12
Convert your grams of Pb(NO3)2 to moles
Find your molar mass from the periodic table
Set-up your calculation to convert your grams to moles using the molar mass
13
Multiple Choice
What is the molar mass of Pb(NO3)2 ?
mol331.208 g
241.214 mol
mol331.2 g
331.2 mol
14
Now you have the molar mass, AND you have your mass of Pb(NO3)2 in grams.
How many moles do you have?
15
Multiple Choice
How many moles of Pb(NO3)2 are in 0.042 g ?
0.000127 mol
(aka 1.27 x 10-4 mol)
0.0126 mol
(aka 1.26 x 103 mol)
126 mol
(aka 1.26 x 102 mol
16
Looking back:
Given that 42 mg of Pb(OH)2 precipitate formed, calculate the moles of Pb(NO3)2 in 50 mL of solution.
You have your 0.000127 mol of Pb(NO3)2 and now you need to put it in 50 mL of solution.
17
Convert your units so that you have the proper units of moles/Liter
You currently have mol/mL
18
Multiple Select
What is a good set-up for converting mol/mL to mol/L?
mLmol × 1 L1000 ml = L1000 mol
mLmol×1000 mL1 L = 1000 mL2mol⋅L
19
Calculate the final molarity of your Pb(NO3)2
20
Multiple Choice
Calculate the concentration of Pb(NO3)2 in your solution.
0.00254 M
0.0254 M
0.0827 M
Concentration Calculations
Working through the steps
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