A 25.0 mL sample of diluted hydrogen peroxide is acidified and titrated with 0.0180 mol/L potassium…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A sample of diluted hydrogen peroxide is acidified and titrated with potassium permanganate. It needs . The equation is . Find the moles of permanganate, the moles of hydrogen peroxide and its concentration in the sample.
Need a reminder? The key ideaShow
At the end point, the moles of the two reagents are in the ratio of the balanced equation. Moles = concentration in mol/L times volume in litres. With n-factors, .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Permanganate. .
Step 2. Hydrogen peroxide. The ratio is , so .
Step 3. Concentration. .
Answer: , and .
Watch out. The ratio here is not 1 to 5. Always take it from the balanced equation for the reaction in front of you.
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