BACE Molar Solutions
Presentation
•
Science
•
9th - 12th Grade
•
Practice Problem
•
Medium
+4
Standards-aligned
Summer Smith
Used 6+ times
FREE Resource
7 Slides • 8 Questions
1
Molarity and
Molar Solutions
BACE Prep
2
The Mole
1 mole is equal to 6.02 x 10^23 particles of a substance
1 mole is also equal to the molecular weight of a compound, expressed in grams
3
The Mole
1 mole of carbon atoms weighs 12g
4
The Mole
1 mole of water weighs
(1 x 2) + 16 = 18g
5
Math Response
What is the mass of one mole of methane, CH4. (Use whole numbers.)
6
Math Response
What is the mass of one mole of glucose? (Use whole numbers.)
7
Multiple Choice
What is the mass of 5 moles of sodium chloride? (Use two decimal places.)
292.25
58.45
6.02
5
8
Molarity
Molarity indicates the moles of a substance per liter of solution.
A 1M sol'n has one mole per liter.
A 5M sol'n has 5 moles per liter.
9
Math Response
How many grams of glycine are needed to make a 2M aqueous glycine solution? (Use whole numbers.)
10
Math Response
The MW of Magnesium Chloride is 95.21 Da. How much MgCl2 is needed to make 2L of a 1M solution? (Use two decimal places.)
11
Multiple Choice
The MW of glycine is 75 Da and the MW of glucose is 190 Da. You have a 1M sol'n of glycine and a 1M sol'n of glucose. How do the number of moles of glucose and glycine compare?
same # of moles of glycine and glucose
more moles of glucose
more moles of glycine
12
Multiple Choice
The MW of glycine is 75 Da and the MW of glucose is 190 Da. You have a 1M sol'n of glycine and a 1M sol'n of glucose. How do the number of grams of glucose and glycine compare?
same # of grams of glycine and glucose
more grams of glucose
more grams of glycine
13
Solution Preparation
Use conversion factors to calculate the amount of solute(s) you will need.
Dissolve the substance(s) in about 70% of the water. Adjust pH, if needed. Then bring the final volume to the desired volume by adding more water.
Use the most accurate tools available, typically graduated cyliners or volumetric flasks.
14
100mL x (1L/1000mL) x (58.44g/1mol) x (5mol/1L) = 29.29g NaCl
Dissolve in some water (70-80mL?) and raise the volume to 100mL.
How would you prepare 100mL of a 5M NaCl solution?
MW of NaCl is 58.44 Da
Sample Problem
15
Math Response
The MW of glucose is 180 Da. How many grams of glucose would you need to make 400mL of a 0.36M solution? (Use 2 decimal places.)
Molarity and
Molar Solutions
BACE Prep
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