Chapter 14d Volumetric Analysis Calculations

During a practical to determine the concentration of an unknown solution, the following titres were obtained: 21.45 mL, 20.67 mL, 20.62 mL & 20.71 mL. The average titre is:

• 20.86 mL

• 20.67

A 0.100 M H₂SO₄ solution is neutralised with 10.0 mL of a solution of 0.300 M KOH.

H₂SO₄(aq) + 2KOH(aq) → K₂SO₄(aq) + 2H₂O(l)

What volume of sulfuric acid was neutralised?

• 15 mL

• 30 mL

• 60 mL

15.0 mL of a nitric acid solution is required to react completely with 10.0 mL of a 0.100 M Ca(OH)₂ solution.

2HNO₃(aq) + Ca(OH)₂ → Ca(NO₃)₂(aq) + H₂O(l)

What is the concentration of the nitric acid solution?

• 0.133 M

• 0.0667 M

• 0.0333 M

The correct reading from the burette shown is

• 27.76 mL

• 28.24 mL

• 27.8 mL

• 28.2 mL

The three concordant titres that should be used in the calculations are

• 2, 4 & 5.

• 1, 2 & 3.

• 3, 4 & 5.

• 1, 2 & 5.

Calculate the average titres for these five titres.

• 25.63 mL

• 25.42 mL

The concentration of ethanoic acid (CH₃COOH) in vinegar was determined by titration with a standardised solution of sodium hydroxide. A 25.00 mL aliquot of vinegar required 21.56 mL of 0.995 M NaOH to reach the end point. Calculate the concentration of ethanoic acid.

CH₃COOH(aq) + NaOH(aq) → NaCH₃COO(aq) + H₂O(l)

• 0.858 M

• 0.429 M

• 0.000536 M