Asked by Lou
An aqueous solution of NaCl has a concentration of .500 M. 35.0 mL of this solution is allowed to evaporate to a volume of 20.0 mL.
a) Is the solution more concentrated or more dilute afterwards?
b) What is the new concentration of the solution?
a) Is the solution more concentrated or more dilute afterwards?
b) What is the new concentration of the solution?
Answers
Answered by
DrBob222
M = mols/L
a. If some solvent (L) has evaporated then L is a smaller number and M goes up and it is more concentrated.
b. new concn =
I would use 0.500M x (35/20) = ? BUT YOU may prefer to use the dilution formula.
c1v1 = c2v2
c = concentration
v = volume
35 mL x 0.500 = 20 mL x ?M
?M = 35*0.500/20 = ?
a. If some solvent (L) has evaporated then L is a smaller number and M goes up and it is more concentrated.
b. new concn =
I would use 0.500M x (35/20) = ? BUT YOU may prefer to use the dilution formula.
c1v1 = c2v2
c = concentration
v = volume
35 mL x 0.500 = 20 mL x ?M
?M = 35*0.500/20 = ?
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