Re: molarity

John Doe III wrote:
>
> Let's assume 100 g of NaCl (MW = 58 g./ mol) is dissolved in 3.5 L of water.
> Is the molarity
> A) 100 / (58 * 3.5)
> or
> becuase NaCl dissociates into 2 ions
> B) 2 * 100 / (58 * 3.5)
>
> ???
>
> What is the molarity of a salt solution?
>
> is it the number of moles of all dissociated solutes that are dissolved in
> the solvent divided by liter of solvent????

You have moles/liter of Cl-, Na+, and NaCl by formula unit. All three
numbers are identical. Cf: molality (correct spelling) and
colligative properties.

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Uncle Al
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