What is the concentration of a 40⋅g mass of sodium hydroxide dissolved in 250⋅mL of water?

1 Answer
anor277
Jul 30, 2017

Approx. 4⋅mol⋅L−1.......or 4.0⋅normal

Explanation:

[NaOH]=40⋅g40⋅g⋅mol−1250×103⋅mL×10−3⋅L⋅mL−1=4.0⋅mol⋅L−1

This follows the normal means of calculation, concentration=moles of solutevolume of solution, and thus get an answer in mol⋅L−1.

We assume no volume change on dissolution.

And under these circumstances, where the solute causes no further water hydrolysis, molarity ≡ normality...........

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