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Question
Answer the following in one or two sentences.
A solution concentration is expressed in molarity and not in molality while considering osmotic pressure. Why?
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Solution
- Fraction `n/v` corresponds to the molarity (M) of a solution of a non-dissociating or totally dissociating solute `pi = n/v RT`
- Osmotic pressure increases by `1/273` for each degree of temperature increase.
- But osmotic pressure measurements are made at specific constant temperatures. In this case, M remains constant.
`M = n_2/V` [Temp. dependent]
`m = n_2/W_1` [Temp. independent]
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