1) List the known and unknown quantities.
Initial conditions.
Concentration: 1.75 M NaF.
Volume: unknown.
Final conditions.
Concentration: 0.234 M NaF.
Volume: 681 mL.
2) Set the equation.
[tex]C1V1=C2V2[/tex]3) Plug in the known quantities and solve for V1.
[tex](1.75\text{ }M\text{ }NaF)(V1)=(0.234\text{ }M\text{ }NaF)(681\text{ }mL)[/tex][tex]V1=\frac{(0.234MNaF)(681mL)}{1.75\text{ }M\text{ }NaF}[/tex][tex]V1=91.06\text{ }mL[/tex]We need 91.06 mL of a 1.75 M NaF solution to make 681 mL of a 0.234 M NaF solution.
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