IB Chemistry HL 1.4.5 Molar Concentration Questions

Use c=n/V with consistent units, then apply mole ratios, dilution and mixing relationships to solve concentration, amount and volume problems.

Exam points

Calculate molar concentration c=n/V from amount of solute and solution volume, converting cm³ and dm³ units correctly.
Use c=n/V and stoichiometric mole ratios with titration data to determine an unknown concentration, amount or required volume.
Apply dilution, mixing and standard-solution relationships to determine final concentration or volume while tracking total solution volume.

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Study 1.4.5—Molar concentration conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Benzoic acid is a weak acid. The graph shows how the pH changes during the titration of a $10.0 \mathrm{~cm}^{3}$ aqueous solution of benzoic acid with aqueous sodium hydroxide.

Calculate the concentration of the benzoic acid solution, in $\mathrm{mol} \mathrm{dm}^{-3}$ , given that the sodium hydroxide concentration was $0.010 \mathrm{~mol} \mathrm{dm}^{-3}$ .

$\text { « }(0.020 \times 0.010) \div 0.010=\text { » }$

0.020 «mol dm ${ }^{-3}$ »

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IB Chemistry HL 1.4.5 Molar Concentration Questions question 1