Experiment 7: Determination of Mn in Steel by Visible Spectroscopy Print this ou

Question

Experiment 7: Determination of Mn in Steel by Visible Spectroscopy Print this out and turn this it at the beginning of lab. 1. What reagent is used to oxidize Mn2 to Mno,? 2. What is the manganese content of the known steel sample? 3. Why is ammonium persulfate added to the steel digest? 4. A 1.6250 g sample of steel standard is used to prepare the standard solutions. What is the concentration of manganese in the sample, in ppm (mg/L)? 5. In the standard additions equation, what is Cs (define the variable)?

Explanation / Answer

Answer

1. Flourine gas can be used to oxidize Mn+2 to MnO4-. It can also be oxidized during Chlorination using Br and HClO4 as reagents.

2. Data inadequate (need experimental observations and values)

3. The manganese content of most steels is less than 1 percent. Therefore it cannot be analyzed for Mn quantitatively in the presence of huge amounts of Fe by chemical procedures only. A colorimetric technique based on the typical purple color of MnO4-, is used effectively to give error free results. The technique is based on the dissolution of the steel in nitric acid which also oxidizes the Mn to Mn2+. The peroxydisulfate also oxidizes and removes other organic matter. The S2O82- is a powerful oxidizing agent. It may oxidize some of the ions to MnO2.

4. Data inadequate (need experimental results and values)

5. Cs in standard additions equation Cs stands Concentration Standard.  

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