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Derienw6586
13.07.2019 •
Chemistry
A20.0 % by mass solution of phosphoric acid (h3po4) in water has a density of 1.114 g/ml at 20°c. what is the molarity of this solution?
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Ответ:
Molarity is 2.272M
Explanation:
The mass % of phosphoric acid is 20.0%
It means in 100 g of solution there is 20g of phosphoric acid in it.
Molarity = moles of solute dissolved per litre of solution.
So we need volume of solution
Volume can be calculated from mass and density as
Volume = mass / Density = 100/1.114 = 89.77 mL = 0.08977 L
Moles of solute = mass of solute / molar mass of solute
moles of solute = 20g / 98 = 0.204
molarity =![\frac{moles}{volume}=\frac{0.204}{0.08977} =2.272M](/tpl/images/0084/2659/bc819.png)
Ответ: