Quantitative AnalysisEdexcel GCSE Chemistry: Flashcards

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What is the equation for concentration in mol dm-3?

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What is the equation for concentration in mol dm-3?: Concentration (mol dm-3) = moles of solute / volume of solution (dm3).
How do you convert cm3 to dm3?: Divide by 1000.
What three pieces of apparatus are used in an accurate acid-alkali titration?: A burette, a pipette and a suitable indicator.
What are concordant results in a titration?: Two or more titre volumes that agree closely (usually within 0.10 cm3), used to calculate a reliable mean.
What is the formula for percentage yield?: Percentage yield = (actual yield / theoretical yield) x 100.
Name three reasons the actual yield of a reaction is usually less than the theoretical yield.: Incomplete reactions, practical losses during the experiment, and competing/unwanted side reactions.
What is the formula for atom economy?: Atom economy = (Mr of desired product / sum of Mr of all reactants) x 100.
What does atom economy measure?: The proportion of the total mass of reactants that ends up as the desired product, rather than wasted as by-products.
What is the molar volume of any gas at room temperature and pressure?: 24 dm3 (24,000 cm3) per mole.
What does Avogadro's law state?: Equal numbers of moles of any gas occupy equal volumes at the same temperature and pressure.
What equation links moles, concentration and volume?: Moles = concentration (mol dm-3) x volume (dm3).
Name four factors, besides atom economy, that can influence which reaction pathway is chosen to produce a product.: Yield, rate, equilibrium position, and usefulness of by-products.