A sample of 5.52 grams of NaOH is dissolved

into 659 mL of aqueous 0.250 M NaOH (assume
no volume change). This solution is
then poured into 1.52 gallons of water. (You
may assume that the two volumes can be
added.) What is the concentration of NaOH
in the final solution?

1 answer

mols NaOH in 5.52 grams is mols = grams/molar mass = ?
mols NaOH in the solution of NaOH is mols = M x L = ?
Total mols NaOH = mols in the 5.52g + mols in the solution = ?

Convert 1.52 gallons to L. 1 gallon = 3.785 L.

total volume is L in 1.52 gallons + 659 mL(convert to L first).

Then M of the final NaOH solution is M = total mols NaOH/total volume solution.
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