A student wants to make 135. mL of 8.5 M KBr by diluting a 6.0 M KBr solution. How much of that solution should be used?

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Answer 1 · 2018-03-05T04:49:50

#V = 101.25 # #mL# from concentrated solution

Using the dilution equation:

#(V M)_1 = (V M)_2#

Where
V: volume (L)
M: molarity (mol/L)

So, substituting data in previous equation

#(V# x # 8.5 "mol"/L)_1 = (0.135 L # x # 6"mol"/L)_2#

Solving

#V = 0.10125 # #L#

Or,

#V = 101.25 # #mL# from concentrated solution