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CAIE A-Level Chemistry 7.2.2 Names and Formulae of Common Alkalis

Practise recalling the syllabus names and formulae of sodium hydroxide, potassium hydroxide and ammonia.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • match sodium hydroxide with NaOH and potassium hydroxide with KOH, including the hydroxide ion
  • match ammonia with NH3 and distinguish the molecular alkali from hydroxide compounds

7.2.2—Names and formulas of the common alkalis question 1

[Maximum number: 1]

NO and NO2\mathrm{NO}_{2} react at 25∘C25^{\circ} \mathrm{C} to give N2O3\mathrm{N}_{2} \mathrm{O}_{3} as shown in the equation.

NO( g)+NO2( g)⇌N2O3( g)ΔH=−7.2 kJ mol−1\mathrm{NO}(\mathrm{~g})+\mathrm{NO}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{N}_{2} \mathrm{O}_{3}(\mathrm{~g}) \quad \Delta H=-7.2 \mathrm{~kJ} \mathrm{~mol}^{-1}

The reaction is reversible and reaches equilibrium in a closed system.

A student titrates nitric acid with a base to form a solution containing aqueous magnesium nitrate.

Identify a base that the student could use.

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