A student titrated a solution of 25 cm3 of NaOH of concentration 0.1 mol/dm3 with H2SO4. She achieved four results; 25.8 cm3, 26.15 cm3, 26.25 cm3 and 26.45 cm3. Calculate the concentration of H2SO4 using concordant titres.
H2SO4 + 2NaOH → Na2SO4 + 2H2O
Concordant titres: 26.15 cm3 and 26.25 cm3
Mean titre: (26.15+26.25)/2= 26.2 cm3/1000= 0.0262 dm3
moles of NaOH: (25/1000)*0.1= 0.0025 mol
Ratio of H2SO4: NaOH= 1:2
Moles of H2SO4: 0.0025/2= 0.00125 mol
Concentration of H2SO4: 0.00125/0.0262= 0.0477 mol dm-3
SS
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