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Topic 2: Quantitative Analysis
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Chemistry Mapa Mental sobre Topic 2: Quantitative Analysis, criado por Alice Clayden em 24-04-2013.
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chemistry
chemistry
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Alice Clayden
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Alice Clayden
mais de 11 anos atrás
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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
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
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)
Concentration can also be measured in moles per cubic decimetre (mol 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)
Neutrilisation with titration : hydrogen ions from acid combine with hydroxide ions from alkali to make water.(neutral) H + OH = H20
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
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