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Chemistry - Quantitative Chemistry (Concentration (Concentration =…
Chemistry - Quantitative Chemistry
Ar and Mr
Ar is the Relative Atomic Mass of a element (Bottom Number an periodic table)
Mr is the Relative Molecular Mass, comes from the sum of the Ar of a molecuar
Limiting reagents
The reactant is used up first and prevents more product from being made is the limiting regent
Substance that is in excess or doesn't get used up is the excess reagent
Balancing equations
Mole calculations
Mass = Mr x Moles
Mr = Mass/Moles
Moles = Mass/Moles
Mass must be in grams
Mole ratio between molecules is the big numbers in the balanced equation
Titrations
Titration is the slow addition of one solution of a known concentration (called a titrant) to a known volume of another solution of unknown concentration .
This is until the reaction reaches neutralisation, which is often indicated by a colour change
Equipment - Burette, Conical flask, White tile
Volume of gases
Volume = Moles x 24
Volume has to be in (dm3)
24 is the molar volume, the volume that one mole occupies at room temperature
Atom Economy is the mass of the product you want by the whole products gained times by 100
Percentage Yield is the mass of the product you got by the product you expected to gain times by 100
Concentration
Concentration = Mass/Volume
Volume has to be in (dm3)
Concentration is in g/dm3)
Concentration is a measure of how much solute is dissolved in a solution
Converting Units
cm3 --> dm3 divide by 100
m3 to dm3 multiply by 100