@brianb@fosstodon.orgDo any #chemistry teachers have an equilibrium constant lab that does _not_ use iron and thiocyanate? I've been looking and looking, but I cannot find any other examples of lab procedures.
@brianb If electrochemistry is an option, there is the iron hexacyanoferrate / ferrite equilibrium. Create different Fe(II)/Fe(III) ratios in one half cell, measure the voltage, use the Nernst eq. With a UV/Vis spectrometer, there is the I₂+I⁻ <-> I₃⁻ system that can be studied.
@brianb Curious - Why not the FeSCN lab? Too easy to find cooked labs on the internet? Looking for an additional lab?
@MichaelPorter I just didn't have it in the closet is all. I found a copper complex ion that worked really well. I'll send later tonight for your thoughts when kids are in bed.
Here's a qualitative eq lab using CuCls [1] I modified from a ChemEdX blog post and then a quantitative one I'm trying tomorrow (based on an old WebAssign lab I found form 2011) calculating Ksp for Ca(OH)2 via titration [2].
1. https://docs.google.com/document/d/1TKR41HoOi9DujbhJCAADQ2et8rcvqwUIxLuPca_EEgk/edit?usp=sharing
2. https://docs.google.com/document/d/1wHh2TosRGok8pYp5AgksEwAi9BniNycOdqvgLMfSkJs/edit?usp=sharing