Top Posters
Since Sunday
New Topic  
Posts: 27
Rep: 0 0
2 months ago
A sample of pure tin metal is dissolved in nitric acid to produce 15.00 mL of solution containing Sn2+.  When this tin solution is titrated, a total of 42.1 mL of 0.145 mol/L KMnO4 is required to reach the equivalence point.

b.    What is the concentration of the Sn2+ solution?

  Find the concentration of the Sn2+(aq) in mol/L:  (give your answer to 3 decimal places)

Read 110 times
3 Replies
2 months ago
Complete balanced overall redox reaction is:

16 H+ + 5Sn2+ + 2MnO4- → 2Mn2+ + 5Sn4+ + 8H2O


In acidic medium, potassium permanganate acts as a strong oxidizing agent. An oxidizing agent oxidizes the substrate present in the solution and gets reduced in the process. When an acidic solution of tin reacts with potassium permanganate, it oxidizes tin from its +2 oxidation state to +4 oxidation state. Simultaneously, Mn from +7 oxidation state gets reduced to +2 oxidation state. The individual oxidation and reduction reaction can be expressed as:

Reduction reaction: 8H+ + MnO4- + 5e-→ Mn2+ + 4H2O ......(1)

Oxidation reaction: Sn2+ → Sn4+ + 2e- ......(2)

To cancel out the electrons, multiply equation (1) by 2 and equation (2) by 5, we get

16H+ + 2MnO4- + 10e-→ 2Mn2+ + 8H2O ......(3)

5Sn2+ → 5Sn4+ + 10e- ......(4)

Adding equation (3) and (4), we get the complete balanced redox reaction equation as:

16 H+ + 5Sn2+ + 2MnO4-→ 2Mn2+ + 5Sn4+ + 8H2O

Here, Mn in +7 oxidation state shows violet color and on getting reduced to +2 oxidation state becomes colorless. Therefore, acting as a self-indicator in this reaction. +2 oxidation state is the most reduced form of manganese and thus indicates the end point of the titration.
2 months ago
Please mark the topic solved if you're happy polishprodigy93

Otherwise, reply back for more explanations Grinning Face
Answer accepted by topic starter
Top Poster
Posts: 24524
2 months ago
Sign in or Sign up in seconds to unlock everything.
Please mark the topic solved if you're happy polishprodigy93 Otherwise, reply back for more explanations Grinning Face

Missed the last part, finding the concentration Grinning Face with Smiling Eyes

So here you go!
Attached file
You must login or register to gain access to this attachment.
The best way to say thank you is with a positive review: 

Your support goes a long way!

Make a note request here
Related Topics
New Topic      
Post your homework questions and get free online help from our incredible volunteers.
Learn More
Improve Grades
Help Others
Save Time
Accessible 24/7
  420 People Browsing
Your Opinion
What percentage of nature vs. nurture dictates human intelligence?
Votes: 75

Related Images

▶️ Video: Passive Smoke Exposure

For a complete list of videos, visit our video library