C5 - Quantitative analysis
- Created by: jefl010101
- Created on: 23-03-17 18:48
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- C5 - Quantitative Analysis
- Moles, Molecular masses, percentage mass and empirical formula.
- Quantitative Analysis & Titrations
- Moles = Concentration x Volume
- A litmus or phenolphthalein sample added will give a sharp colour change at the neutral point.
- A simple pH curve shows a sudden change in pH for a very small volume change in acid or alkali at the end point.
- The more concentrated the solution, the more crowded the particles.
- GDA on food packaging is a guideline daily amount, often expressed as a percentage.
- Gas volumes and equilibria
- Gas volume measurements
- Gas syringe
- Upturned burrete over water
- Loss of mass of reactants
- Reversible reactions
- Forward reaction speed = Backward reaction speed
- Changes in temp. vol. or pressure effect equilibrium
- The reactant that is used up by the end is the limiting reactant.
- The contact process.
- Sulfur dioxide + oxygen = sulfur trioxide
- 450'c and atmospheric pressure
- Forward reaction is exothermic
- Catalyst
- Doesn't affect equilibrium position
- Makes reaction go faster
- Gas volume measurements
- Strong and weak acids, Ionic equations and precipitations
- pH of a weak acid is higher than that of a strong acid.
- More H+ ions = lower pH (stronger acid)
- Ionic equations, with state symbols (s) or (aq) represent precipitiation reactions.
- Barium Chloride is used to test sulfates by precipitation.
- In a precipitation reaction, ions must collide with each other to form a precipitate.
- Preparation of an insoluble compound.
- Mixing rreactants
- Filtering to get the residue
- Washing and drying the residue.
- pH of a weak acid is higher than that of a strong acid.
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