What is the the molarity of pure water ?
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We know that molarity=mol/L
The molar mass of water is roughly 18 g/mol. The density of water is roughly 1 g/mL. Since there are 1000 mL in a litre, there are 1000 grams in a litre of water.
# mol=(mass)/(molar mass)=(1000 g)/(18 g/mol)=55.56 mol water
Plugging back into the molarity formula, we get: M=(55.56 mol)/1 L=55.56 M
It is important to note that this value will change with temperature.
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