The neutralisation of an acid by an alkali is an exothermic reaction. The concentration of an acid can be found by measuring the temperature change when the acid reacts with an alkali. You will determine the concentration of sulfuric acid by adding aqueous sodium hydroxide of known concentration to the sulfuric acid and measuring the temperature change. FA 1 is $$$2.01 \mathrm{~mol} \mathrm{dm}^{-3}$$$ sodium hydroxide, NaOH . FA 2 is sulfuric acid, $$$\mathrm{H}_{2} \mathrm{SO}_{4}$$$. Calculate the amount, in mol, of sodium hydroxide, FA 1, pipetted into the cup. amount of $$$\mathrm{NaOH}=$$$ .......................... mol (ii) The equation for this neutralisation reaction is shown. $$\[ 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \]$$ Calculate the concentration, in mol $$$\mathrm{dm}^{-3}$$$, of sulfuric acid in FA 2. Show your working. concentration of $$$\mathrm{H}_{2} \mathrm{SO}_{4}=$$$ .......................... $$$\mathrm{moldm}^{-3}$$$ DO NOT WRITE IN THIS MARGIN

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_35 Year：2024 Question No：1(c)

Answer:

Knowledge points:

2.2.1 define and use the term mole in terms of the Avogadro constant

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:

Related Question