40g of NaOH is added to water to create 1 L of solution. The resulting solution has a SG of 1.07. a) Calculate the mass (in lb) of 1 L of solution? b) Calculate the molecular mass of NaOH? c) Calculate the molarity of NaOH in the solution.?

1 Answer
anor277
Oct 16, 2017

We know that the density of the solution, ρsolution=1.07⋅g⋅mL−1

Explanation:

a. And so if we gots a 1⋅L volume....then we have a mass of.....

1000⋅mL×1.07⋅g⋅mL−1=1070⋅g..

But 1⋅lb≡454⋅g...

And so 1070⋅g≡1070⋅g×1454⋅g⋅lb−1=2.36⋅1lb−1 =2.36⋅11lb=2.36⋅lb

b. And the molar mass of NaOH is simply....

(22.99+15.999+1.00794)⋅g⋅mol−1=40.0⋅g⋅mol−1.

c. And the molarity is simply the quotient....

Molarity=Moles of soluteVolume of solution

=40⋅g40.0⋅g⋅mol−11.00⋅L=1.00⋅mol⋅L−1.....

I don't know why the septic tanks don't go back to using pounds, shillings, and pence if they are bent upon using lbs, and inches, and tons. And while they are at it, they could recognize Queen Elizabeth II as their lawful sovereign.

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