The identity of a Group 1 metal in a metal carbonate may also be determined by titration with acid． $$$\mathbf{Z}_{2} \mathrm{CO}_{3}$$$ is a Group 1 metal carbonate．The metal may or may not be the same as that in FA 1．You will determine which metal is present in $$$\mathbf{Z}_{2} \mathrm{CO}_{3}$$$ ． FA 3 is $$$7.26 \mathrm{gdm}^{-3} \mathbf{Z}_{2} \mathrm{CO}_{3}$$$ ． FA 4 is $$$0.0500 \mathrm{~mol} \mathrm{dm}^{-3}$$$ sulfuric acid， $$$\mathrm{H}_{2} \mathrm{SO}_{4}$$$ ． FA 5 is bromophenol blue indicator．（b）From your accurate titration results，calculate a suitable mean value to use in your calculations． Show clearly how you obtain the mean value． $$$25.0 \mathrm{~cm}^{3}$$$ of FA 3 required .......................... $$$\mathrm{cm}^{3}$$$ of FA 4．［1］

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s25_qp_35 Year：2025 Question No：2(b)

Answer:

Knowledge points:

2.4.1.1 reacting masses (from formulae and equations) including percentage yield calculations

2.4.1.2 volumes of gases (e.g. in the burning of hydrocarbons)

2.4.1.3 volumes and concentrations of solutions

2.4.1.4 limiting reagent and excess reagent (When performing calculations, candidates’ answers should reflect the number of significant figures given or asked for in the question. When rounding up or down, candidates should ensure that significant figures are neither lost unnecessarily nor used beyond what is justified (see also Mathematical requirements section).) deduce stoichiometric relationships from calculations such as those in 2.4.1 (1)–(4)

Answer:

Knowledge points:

Solution:

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