CHEMISTRY Paper 1 Inorganic and Physical Chemistry
This question is about a titration. A student dissolves an unknown mass of sodium hydroxide in water to make 200 cm3 of an aqueous solution. A 25.0 cm3 sample of this sodium hydroxide solution is placed in a conical flask and is titrated with 0.150 mol dm–3 sulfuric acid. The equation for this reaction is shown. 2 NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2 H2O(l) Table 1 shows the results of the titrations. Table 1 box Titration Rough 1 2 3 Final reading / cm3 20.75 40.35 21.05 40.60 Initial reading / cm3 0.00 20.75 1.20 21.05 Titre / cm3 20.75 19.60 19.85 19.55 . Calculate the mass of sodium hydroxide used to make the original solution. [5 marks] Mass
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this question is about a titration a student dissolves an unknown mass of sodium hydroxide in water to make 200 cm3 of an aqueous solution a 250 cm3 sample of this sodium hydroxide solution is pl