Osmotic pressure may be used to determine the molecular weight of pure substances. It is an especially useful technique because low concentrations of solute produce relatively large osmotic pressures. Although more sophisticated techniques are now available to determine molecular weight, osmotic pressure is still used occasionally because of its simplicity. Determine the molecular weight of myoglobin (an oxygen storage protein that gives muscle its red color). The osmotic pressure of a 1.0-mL water solution containing 1.5 x 10 ~3 g of the protein was measured at 2.06 x 10 ~3 atm at 25°C.

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Osmotic pressure may be used to determine the molecular weight of pure substances. It is an especially useful technique because low concentrations of solute produce

relatively large osmotic pressures. Although more sophisticated techniques are

now available to determine molecular weight, osmotic pressure is still used

occasionally because of its simplicity. Determine the molecular weight of

myoglobin (an oxygen storage protein that gives muscle its red color). The

osmotic pressure of a 1.0-mL water solution containing 1.5 x 10

~3 g of the protein

was measured at 2.06 x 10

~3 atm at 25°C.

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