1. A student prepares 50.0 mL of a 2.5M solution by diluting 10.0 mL of a stock...

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Chemistry

1.A student prepares 50.0 mL of a 2.5M solution by diluting 10.0 mLof 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 diluting5.0 mL of 7.5M stock solution. How much water was used?

Can you please show all of the work and calculations for #1a&b and #2 so I can understand.
Please and ThankYou!!!!

Answer & Explanation Solved by verified expert

4.3 Ratings (751 Votes)

Â Â

Â Â Before dilutionÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â After dilution

Â Â M1 Â Â = M M2 = 2.5M

V1 Â Â = 10ml Â Â V2Â Â = 50ml

Â Â M1V1 = M2V2

M1Â Â = M2V2/V1

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 2.5*50/10

= 12.5M

volume of water = V2-V1Â Â = 50-10 = 40ml

Â Â M1 Â Â = 7.5M M2 = 3M

V1 Â Â = 5ml V2

Â Â M1V1 = M2V2

V2 Â Â = M1V1/M2

= 7.5*5/3 Â Â Â Â Â Â Â Â = 12.5ml

volume of water = V2-V1 = 12.5 -5 = 7.5ml Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â

Â Â Â

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1. A student prepares 50.0 mL of a 2.5M solution by diluting 10.0 mL of a stock...

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80.2K

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Chemistry

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