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The amount of iron in a newly developed, heat-resistant aluminium alloy is to be determined - VCE - SSCE Chemistry - Question 1 - 2010 - Paper 1
Question 1
The amount of iron in a newly developed, heat-resistant aluminium alloy is to be determined. An 80.50 g sample of alloy is dissolved in concentrated hydrochloric aci... show full transcript
Worked Solution & Example Answer:The amount of iron in a newly developed, heat-resistant aluminium alloy is to be determined - VCE - SSCE Chemistry - Question 1 - 2010 - Paper 1
Step 1
a. Write a balanced half-equation, including states, for the conversion of MnO₄⁻ ions, in an acidic solution, to Mn²⁺ ions.
Answer
The balanced half-equation for the conversion of MnO₄⁻ ions to Mn²⁺ ions in an acidic solution is:
In this reaction, permanganate ions ( MnO₄⁻) are reduced to manganese ions ( Mn²⁺) in the presence of hydrogen ions ( H⁺) from the acidic solution.
Step 2
b. Calculate the average volume, in mL, of the concordant titres of the potassium permanganate solution.
Answer
To find the average volume of the concordant titers, we first identify the concordant values from the titration results. The volumes used are:
- 22.03 mL
- 20.25 mL
- 21.97 mL
- 21.99 mL
The concordant volumes are the ones that are close to one another, which in this case are 21.97 mL and 21.99 mL. We now calculate the average:
Thus, the average volume of the concordant titers is 21.98 mL.