A student wanted to find the concentration of some dilute sulfuric acid by titration. The student found that 25.0 cm³ of 0.0400 mol/dm³ NaOH(aq) reacted exactly with 20.0cm of H,SO (aq)(1) Name a suitable indicator to use in this titration.(ii) Calculate the concentration of the H.SO,(aq) in mol/dm³ using the following steps.Calculate the number of moles of NaOH in 25.0 cm³.[1]• Deduce the number of moles of H,SO, that reacted with the 25.0 cm³ of NaOH(aq)moles=moles = Calculate the concentration of H₂SO,(aq) in mol/dm³.concentration =mol/dm131g/dm³ [2]concentration =(iii) Calculate the concentration of the 0.0400 mol/dm³ NaOH(aq) in g/dm³.
Question
A student wanted to find the concentration of some dilute sulfuric acid by titration. The student found that 25.0 cm³ of 0.0400 mol/dm³ NaOH(aq) reacted exactly with 20.0cm of H,SO (aq)(1) Name a suitable indicator to use in this titration.(ii) Calculate the concentration of the H.SO,(aq) in mol/dm³ using the following steps.Calculate the number of moles of NaOH in 25.0 cm³.[1]• Deduce the number of moles of H,SO, that reacted with the 25.0 cm³ of NaOH(aq)moles=moles = Calculate the concentration of H₂SO,(aq) in mol/dm³.concentration =mol/dm131g/dm³ [2]concentration =(iii) Calculate the concentration of the 0.0400 mol/dm³ NaOH(aq) in g/dm³.
Solution
(i) A suitable indicator for this titration could be Methyl orange or Phenolphthalein.
(ii) To calculate the concentration of H₂SO₄(aq) in mol/dm³, follow these steps:
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Calculate the number of moles of NaOH in 25.0 cm³. The number of moles can be calculated using the formula: moles = concentration x volume. In this case, moles = 0.0400 mol/dm³ x 25.0 cm³ = 0.001 mol (Note: 1 dm³ = 1000 cm³, so you need to convert the volume from cm³ to dm³ by dividing by 1000).
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Deduce the number of moles of H₂SO₄ that reacted with the 25.0 cm³ of NaOH(aq). In the reaction between NaOH and H₂SO₄, one mole of NaOH reacts with one mole of H₂SO₄. Therefore, the number of moles of H₂SO₄ is also 0.001 mol.
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Calculate the concentration of H₂SO₄(aq) in mol/dm³. The concentration can be calculated using the formula: concentration = moles/volume. In this case, concentration = 0.001 mol / 20.0 cm³ = 0.05 mol/dm³ (Again, remember to convert the volume from cm³ to dm³).
(iii) To calculate the concentration of the 0.0400 mol/dm³ NaOH(aq) in g/dm³, you need to know the molar mass of NaOH, which is approximately 40 g/mol. The concentration in g/dm³ can be calculated by multiplying the concentration in mol/dm³ by the molar mass: 0.0400 mol/dm³ x 40 g/mol = 1.6 g/dm³.
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