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                                     

   

queen_honey_blossom answered 1 year ago
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