Hi, I'm doing a research project in which I am testing the zinc content of soil using EDTA titration with Eriochrome Black T as an indicator. I've been doing a lot of research but, as a high school student, the majority of the information is difficult to understand.
I do have three questions regarding the set up of my experiment:
-Firstly, everything that I read used a liquid as a sample, and since my sample will be soil I was wondering if there is anything special that I would need to do to prepare the soil sample. I was planning on just mixing it with water but my concern was that I would not be able to see the color change of the indicator.
-Secondly, I am going to add zinc to the soil for part of the project and I do not know what type of zinc salt to add. I was thinking maybe zinc oxide?
-And lastly, does anyone know where I can get Eriochrome Black T? I guess it is difficult to store, so no one wants to sell it.