What reagent would allow you to distinguish between FeCl3 and PbCl2? (As if using an analysis scheme)
To distinguish between FeCl3 and PbCl2, you can utilize a reagent called potassium ferrocyanide (K4Fe(CN)6). The analysis scheme involves the following steps:
1. Obtain a small amount of the unknown sample containing either FeCl3 or PbCl2.
2. Take a test tube and add a few drops of the sample into it.
3. Add a few drops of potassium ferrocyanide solution to the test tube containing the sample.
4. Observe and note any changes in the test tube.
Now, let's understand how this reagent and analysis scheme work:
Potassium ferrocyanide is a selective reagent that forms a specific compound with iron (Fe) ions, producing a light blue precipitate called Prussian blue. It does not react with lead (Pb) ions.
In the case of FeCl3, when potassium ferrocyanide is added, a light blue precipitate of Prussian blue will form. This confirms the presence of FeCl3.
However, in the case of PbCl2, potassium ferrocyanide will not produce any observable changes. The absence of a reaction indicates that the sample does not contain PbCl2.
Therefore, the use of potassium ferrocyanide in the analysis scheme allows you to differentiate between FeCl3 and PbCl2 based on the formation of Prussian blue precipitate.