A standard solution of potassium permanganate (KMnO₄) has a concentration of 0.0240 M. It is titrated against a solution of iron (II) sulfate (FeSO₄). The equation for the reaction is 5Fe²⁺(aq) + MnO₄⁻(aq) + 8H⁺(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l) 15.60 mL of the KMnO₄ solution reacts exactly with 20.00 mL of the FeSO₄ solution. The concentration of the FeSO₄ solution, in M, is A. 0.0187 B. 0.0307 C. 0.0936 D. 0.1540

SSCE VCE Chemistry Measuring Solubility and Concentration: A standard solution of potassium

A standard solution of potassium permanganate (KMnO₄) has a concentration of 0.0240 M - VCE - SSCE Chemistry - Question 9 - 2004 - Paper 1

Question 9

A standard solution of potassium permanganate (KMnO₄) has a concentration of 0.0240 M. It is titrated against a solution of iron (II) sulfate (FeSO₄). The equation ... show full transcript

Worked Solution & Example Answer:A standard solution of potassium permanganate (KMnO₄) has a concentration of 0.0240 M - VCE - SSCE Chemistry - Question 9 - 2004 - Paper 1

Step 1

Calculate Moles of KMnO₄ Used

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Answer

To calculate the moles of KMnO₄ used in the titration, use the formula:

$ext{moles} = ext{concentration} imes ext{volume}$

where concentration = 0.0240 M and volume = 15.60 mL (converted to L: 0.01560 L). So:

$ext{moles of KMnO₄} = 0.0240 imes 0.01560 = 0.0003744 ext{ moles}$

Step 2

Use Stoichiometry to Find Moles of FeSO₄

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Answer

From the balanced equation, the stoichiometry indicates:

$1 ext{ mole of KMnO₄} $ \text{ reacts with } 5 ext{ moles of FeSO₄}$

Using the moles of KMnO₄ calculated:

$ext{moles of FeSO₄} = 5 imes 0.0003744 = 0.001872 ext{ moles}$

Step 3

Calculate the Concentration of FeSO₄

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Answer

The concentration of FeSO₄ can now be found using:

$ext{concentration} = rac{ ext{moles}}{ ext{volume}}$

with the volume of FeSO₄ being 20.00 mL (or 0.02000 L):

$ext{concentration of FeSO₄} = rac{0.001872}{0.02000} = 0.0936 ext{ M}$

Step 4

Final Answer Selection

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Answer

The calculated concentration of FeSO₄ is 0.0936 M, which corresponds to option C.

A standard solution of potassium permanganate (KMnO₄) has a concentration of 0.0240 M - VCE - SSCE Chemistry - Question 9 - 2004 - Paper 1

Worked Solution & Example Answer:A standard solution of potassium permanganate (KMnO₄) has a concentration of 0.0240 M - VCE - SSCE Chemistry - Question 9 - 2004 - Paper 1

Calculate Moles of KMnO₄ Used

Use Stoichiometry to Find Moles of FeSO₄

Calculate the Concentration of FeSO₄

Final Answer Selection

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