scotty 9 - Solutions having osmotic pressures greater than...

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Chemistry- Compounds 12.7 – Colligative Properties of Ionic Solutions The ratio of moles of particles in solution to moles of formula units dissolved is called van’t Hoff factor (i): o i = moles of particles in solution / moles of formula units dissolved 1 mol of NaCl produces 2 mol of particles in solution, thus we expect the van’t Hoff factor to be 2. o The expected factor only occurs in very dilute solutions. o The reason that the factors are not exactly equal to the expected values is that some ions pair differently. To calculate colligative properties of ionic solutions use the van’t Hoff factor in each equation as follows: o ΔT f = im * K f (freezing point depression) o ΔT b = im * K b (boiling point elevation) o Π = iMRT (osmotic pressure) 12.7 – Colligative Properties and Medical Solutions The osmotic pressure of solutions administered to patients in the medical field is controlled for the desired effect on the patient.
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Unformatted text preview: Solutions having osmotic pressures greater than those of body fluids are called hyperosmotic. o Tend to take water out of cells and tissues causing it to shrivel as it loses water Solutions having osmotic pressures less than those of body fluids are called hyposmotic. o Tend to pump water into cells and when water enters the cell, it sometimes causes the cell to burst. Isosmotic or isotonic solutions have osmotic pressures equal to those of body fluids. o Intravenous solutions must have osmotic pressures equal to those of body fluids. In the medical field, solution concentrations are often reported in units that indicate the mass of the solute per given volume of solution o Also common is percent mass to volume-which is simply the mass of the solute in grams divided by the volume of the solution in mL * 100%...
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