56106
Description
Topic 2: Quantitative
Analysis
- An equation of a reaction will tell you:
how many particles of reactants and
products there are, how many moles there
are & how many grams there are
- C + O2 = CO2 ...... 1 atom of
carbon, 1 mol of atoms and 12
grams
- C + O2 = CO2 ...... 1 atom of
carbon, 1 mol of atoms and 12
grams
- A mole is a measure of the amount of
substance. A mole of any element always has
the same amount of particles as any other
element (6.0225 x 10'23)
- The mass of a mole of any
element is the same as the
RAM of that element e.g.
carbon's RAM = 12, 12 g of
carbon in 1 mole
- The mass of a mole of any
element is the same as the
RAM of that element e.g.
carbon's RAM = 12, 12 g of
carbon in 1 mole
- Relative formula mass (RFM) = the
RAM's of all a compounds
component elements added together
e.g. CO2 = 12 + (16x2) = 44
- Mass(g) = RAM or
RFM x no. of moles
- Concentration is a
measure of the amount
of solute in 1 cubic
decimetre of solution.
(gdm'3)
- 1dm'3 = 1000cm'3
- Conc (gdm'3) = mass
(g) / volume of solution
(dm'3)
- 1dm'3 = 1000cm'3
- Concentration can also be
measured in moles per cubic
decimetre (mol dm'3)
- amount (mol) = concentration
(mol dm'3) x volume (dm'3)
- amount (mol) = concentration
(mol dm'3) x volume (dm'3)
- The mass of solute can be
measured by evaporating all the
water and measuring the mass of the
solid left behind
- mass of solute =
(mass of container +
solute) - mass of
container
- Mass of
solvent =
(mass of
container +
solution) -
(mass of
container +
solute)
- mass of solute =
(mass of container +
solute) - mass of
container
- Neutrilisation with titration : hydrogen ions from acid
combine with hydroxide ions from alkali to make water.(neutral)
H + OH = H20
- acid + base = salt + water
- acid + base = salt + water
- Salts from insoluble bases: a
commonly used insoluble base is
copper oxide which produces the salt
copper sulfate when mixed with sulfuric acid
- Excess copper oxide is added to a measure volume
of sulfuric acid until there is evidence of copper oxide
left behind.
- It is then filtered to remove the CuO
which leaves a solution of copper sulfate.
- The water can then be evaporated off after it has
been washed with distilled water to remove
impurities
- The water can then be evaporated off after it has
been washed with distilled water to remove
impurities
- It is then filtered to remove the CuO
which leaves a solution of copper sulfate.
- Excess copper oxide is added to a measure volume
of sulfuric acid until there is evidence of copper oxide
left behind.
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