Flashcards in Preparation of Solutions Deck (11):
differentiate concentrated solution from saturated solution
concentrated solution = large qty of solute
saturated solution = excess of undissolved solute particles
Which is false:
a. osmotic pressure - pressure that catalyses osmosis when solvent flows thru semipermeable membrane
b. vapor pressure - pressure at which liquid solvent is in equilibrium with the water vapour
c. all monosaccharides are reducing sugars
d. sucrose is a non-reducing sugar
3 steps for dissolving the chemical into solution: rapid addition of solvent, heating, agitation by swirling.
sequence and justify!
1.heating - increase solubility
2.agitation by swirling- remove saturated solution from contact with the chemical
3.rapid addition of solvent - hastens dissolution of solid materials
Formula for concentration, using specific gravity and percent assay?
concentration = specific gravity x percent assay
After dissolving chemical into solution, what is done to the flask? What does this mean?
calibrated to 20 deg C, solution must be returned to room temperature before final adjustment is made
correct concentration of solution is ensured by 2 things: __ and __
accurate measurement of a chemical
specific gravity is used to prepare dilutions made from conc acids
Molality vs molarity - differentiate these two measurements of concentration
molality - amount of solute per kilogram of solvent
molarity - amount of solute per liter of solvent
molality is not influenced by temperature, but is influenced by pressure
molality is not influenced by temp or pressure
why is normality used? (2 reasons)
chemical reagent classification