IB Chemistry SL 1.4.5 Molar Concentration

Practise calculating amount, solution volume and molar concentration while keeping dm³ and cm³ conversions explicit. Apply formula-unit ratios to ion concentrations, prepare a…

Exam points

use c = n/V with volume in dm³ to calculate concentration, amount or solution volume
multiply by formula subscripts to determine the concentration of a specified dissolved ion
use titre and equation ratios to determine an unknown acid or alkali concentration

[Maximum number: 1]

Phenylethene (styrene) is produced from ethylbenzene in a gas-phase equilibrium.

Figure for Question 1.4.5—Molar concentration question 1 — IB Chemistry SL

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 $0.010 \mathrm{~mol} \mathrm{dm}^{-3}$ . 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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1.4.5—Molar concentration question 1