Question
In: Chemistry
What is the molarity of a solution made by adding 18.00 mL of 5.00 M sodium...
What is the molarity of a solution made by adding 18.00 mL of 5.00 M sodium acetate to 55.00 mL of water? I got 1.64 as the molarity but when i enter that answer it says it is wrong, so i must be doing something wrong. Can you help?
Solutions
Expert Solution
total volume of the solution = 18.00 + 55.00
= 73.00 mL
the molarity of the solution after adding water = millimoles / total volume
= 18.00 x 5.00 / 73.00
= 1.23 M
molarity of the solution = 1.23 M
note : you just used dilution formula C1 V1 = C2 V2
5.00 x 18.00 = C2 x 55.00
C2 = 1.64 M
this value you have got . but you added watet to the solution . so you have to take V2 as total volume 18 + 55 = 73 mL. that is the reason it went wrong .
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