Homework Help: Chemistry

Posted by May on Monday, October 4, 2010 at 6:30pm.

A sample of 9.4 grams of NaOH is dissolved into 693 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 2.37 gallons of water. (You may assume that the two volumes can be
added.) What is the concentration of NaOH in the final solution?
Answer in units of M.

Chemistry - DrBob222, Monday, October 4, 2010 at 6:46pm
moles solid NaOH = 9.4 g/molar mass NaOH = ??
moles NaOH solution = M x L = ??
Add to find the sum of the moles. This is the total NaOH dissolved (in moles).
Now convert 2.37 gallons of water to mL and concn NaOH (molarity) = total moles/L.Post your work if you get stuck.

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