Formulae | Quiz 2 Flashcards
Formula for molarity?
c = n/v where c is concentration in mol/L, n is # of moles, and v is volume in litres
Molarity is also known as
molar concentration
Practical applications of the molarity formula:
in soap, food industry, hot chocolate, iced tea, medicine, etc
Formula of mass-volume concentration:
c = m/v where c is concentration in g/L, m is mass of solute in g, and v is volume of solution in L
Liters can also be expressed in
dm^3
Mass-volume concentration can be used when
the solution has a solid solute and a liquid solvent
Formula for %(mass/volume) concentration:
mass of solute (in g) / volume of solution in mL all * 100%
Formula for %(mass/mass) concentration:
mass of solute (in g) / mass of solution (in g) all * 100
Formula for % volume/volume concentration:
volume of solute (in mL) / volume of solution (in mL) all * 100
Mass/mass concentration is used when
solutions are solid or liquid
Mass/mass concentration applications in real life include
IV, personal care, spinal fluid, CaCl2 and slush, drugs, toothpaste
Volume/volume concentration is used when
both chemicals are liquid
Volume/volume concentration applications in real life include
Diluting acids, alcohol
Formula for trace concentrations (ppm, ppb, ppt):
mass of solute/mass of solution all * 10^6/9/12/etc
Trace concentration is used to
find small amounts of things (in water, medication, etc.)
Formula for density is:
d = m/v
Derive moles from density via:
d = PM/RT
High pressure outside, low pressure inside =
thing gets crushed (can)
High pressure inside, low pressure outside =
attempt to balance out (ears pop)
Why does the human body not crumple from high pressure?
Skeletal system
Bernoulli’s principle:
As speed of a moving fluid (liquid/gas) increases, pressure within fluid decreases
Pressure formula:
Pressure (total) = pressure (partial a) + pressure (partial b)
The ideal gas model assumes:
That gases are in constant, random, straight-line motion; attraction between particles is negligible; volume of particles is negligible; no energy is lost on collision; average kinetic energy is directly proportional to temperature
Under STP, one mole of gas will always take up how many litres of volume?
22.7
Pressure is determined by
how frequently the particles collide with the container
Molar volume formula:
V = M/d (molar volume = molar mass / density)
