In the video you posted you can see that it looks like paper pulp mixed in with the solution as a suspension, this is Zinc Hydroxide formation. The reason for this reaction is that the starting solution wasn't low enough on the pH scale, pH4.5 is too high, bring it down to pH2-2.5 and the Zinc Hydroxide shouldn't precipitate out and the solution will remain clear. If making an all in one I would make sure the solution is still quite acidic for if and when phosphate gets added at the end.
Thank you for that very insightful comment. I did read your adventure where you experienced the same issue and thought it wouldn’t happen to me. If I remember well you made the PH go down somewhere around 3 right?
Yes the suspension is an extremely fine powder. If you mix it takes several hours to settle back and drop to the bottom.
I think that my PH meter was off scale because I recalibrated the meter yesterday and tested the solution again prior trying all options and it was at PH3.5 so I think that initially the solution might have been around that. PH3.5 is still not low enough?
I will try again by making the solution more acidic. I suppose it’s just a mater of adding more ascorbic acid until reaching PH2-2.5 right?
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