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20 June, 14:32

If you compared 1 m solutions, was a 1 m nacl solution more or less hypertonic than a 1 m sucrose solution? what is your evidence? what about 1 m nacl and 1 m glucose and 1 m sucrose?

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  1. 20 June, 17:42
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    When you say the solution is hypertonic, it means that the solution has a higher osmotic pressure. The formula for this is:

    P = iMRT,

    for strong electrolytes, i = number of ions.

    for nonelectrolytes, i = 1

    1. The P for sucrose solution which is a nonelectrolyte (assuming room temp):

    P = (1) (1m) (8.314 J/mol-K) (298 K)

    P = 2477.572 Pa

    The P for NaCl solution, which is a strong electrolyte:

    P = (2) (1 m) (8.314) (298 K)

    P = 4955.144 Pa

    So, that means that NaCl is more hypertonic than the sucrose solution.

    2. For the second question, the P for the combination of 1 m glucose (nonelectrolyte) and 1 m sucrose is:

    P = (1) (1 m) (8.314) (298 K) + (1) (1) (8.314) (298 K) = 4955.144 Pa

    In this case, the osmotic pressures are now equal. It is not hypertonic, but isotonic.
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