The concentration and volume of an aqueous alkali are known. Which additional information is required to calculate the number of moles of acid needed to neutralise the aqueous alkali?

the concentration of the acid

the equation for the acid-alkali reaction

the formula of the acid

the volume of the acid required for neutralisation

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s24_qp_22 Year：2024 Question No：9

Answer:

3.3.1. State that concentration

3.3.2. State that the mole, mol, is the unit of amount of substance

3.3.3.1. amount of substance

3.3.3.2. mass

3.3.3.3. molar mass

3.3.3.4. relative atomic mass or relative molecular / formula mass

3.3.3.5. number of particles, using the value of the Avogadro constant

3.3.4. Use the molar gas volume, taken as 24 dm3 at room temperature and pressure, r.t.p., in calculations involving gases

3.3.5. Calculate stoichiometric

3.3.6. Use experimental data from a titration to calculate the moles of solute, or the concentration or volume of a solution

3.3.7. Calculate empirical formulae and molecular formulae, given appropriate data

3.3.8. Calculate percentage yield, percentage composition by mass and percentage purity, given appropriate data