Question

I'm doing a lab where I am supposed to calculate the "molarity of water" in pure water at 30 degrees Celsius. With the hint that the density of water at 30 degrees Celsius is 0.9957 g/mL. What is the molarity?

I feel like I somewhat understand molarity but I am so lost right now when calculating a Molarity from a density.

Answer 1

We need the defining quotient..........and we gets `[H_2O]=55.3*mol*L^-1`.

Explanation:

`"Molarity"="Moles of solute"/"Volume of solution"`

And here we consider the solute to the be the actual solvent molecules....

And thus we got #((0.9957*g*mL^-1xx1000*mL) /(18.01*g*mol^-1))/(1.00*L)=55.3*mol*L^-1#.