Question
In: Chemistry
1. A student prepares 50.0 mL of a 2.5M solution by diluting 10.0 mL of a...
1.
A student prepares 50.0 mL of a 2.5M solution by diluting 10.0 mL
of a stock solution.
a.) Calculate the concentration of the stock solution.
b.) Calculate the volume of H2O used.
2. What is the volume of a 3.0M solution prepared by diluting
5.0 mL of 7.5M stock solution. How much water was used?
Can you please show all of the work and calculations for #1
a&b and #2 so I can understand.
Please and ThankYou!!!!
Solutions
Expert Solution
Before dilution After dilution
M1 = M M2 = 2.5M
V1 = 10ml V2 = 50ml
M1V1 = M2V2
M1 = M2V2/V1
= 2.5*50/10
= 12.5M
volume of water = V2-V1 = 50-10 = 40ml
M1 = 7.5M M2 = 3M
V1 = 5ml V2
M1V1 = M2V2
V2 = M1V1/M2
= 7.5*5/3 = 12.5ml
volume of water = V2-V1 = 12.5 -5 = 7.5ml
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