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Question 1
1. The Fe<sup>2+</sup> content of iron tablets was determined by titration with a freshly standardised solution of potassium manganate(VII), KMnO<sub>4</sub>. The e... show full transcript
Step 1
Answer
Iron tablets are prescribed primarily to prevent anemia, particularly to address conditions such as hemoglobin deficiency which is crucial for oxygen transport in the blood. They are essential for maintaining adequate iron levels in the body, thereby preventing symptoms related to blood disorders.
Step 2
Answer
Potassium manganate(VII) solutions must be standardised due to their susceptibility to changes in concentration caused by factors such as evaporation and degradation upon storage. It is necessary to standardise just before use to ensure the accuracy of titration results. The reagent used for this purpose is ammonium iron(II) sulfate, which acts as a reducing agent that allows for precise determination of the KMnO<sub>4</sub> concentration.
Step 3
Answer
To prepare the 250 cm<sup>3</sup> of Fe<sup>2+</sup> solution, the five iron tablets were crushed to a fine powder and then dissolved in water. The total mass of iron from the five tablets is calculated as:
This mixture was then transferred to a volumetric flask and diluted with water to reach the 250 cm<sup>3</sup> mark.
Dilute sulfuric acid was added to ensure that the iron(II) ions remain in the ferrous state during the titration and to avoid oxidation, which would convert them to ferric ions.
Step 4
Answer
Dilute sulfuric acid is added to ensure that the iron(II) ions do not oxidize to iron(III) during the titration process. This reaction requires an acidic medium for the reduction of MnO<sub>4</sub><sup>-</sup> to Mn<sup>2+</sup>. The presence of acid helps to maintain the required pH level for the reactions to proceed without any interference.
Step 5
Answer
The molarity (M) of the Fe<sup>2+</sup> solution can be calculated using the titration data provided. Since 18.75 cm<sup>3</sup> of 0.01 M KMnO<sub>4</sub> was used:
Calculate moles of KMnO<sub>4</sub>:
The stoichiometry shows that 1 mole of KMnO<sub>4</sub> reacts with 5 moles of Fe<sup>2+</sup>:
Since these moles are in 25 cm<sup>3</sup>:
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