I added hypochlorous acid (prepared and filtered from calcium hypochlorite solution) into a citrate buffer (mixture of 3M citric acid and 3M sodium citrate, ratio 40:60). I found that a layer a hard, solid, white sediment at the bottom. I suspect the sediment is calcium citrate.
Any idea what's the sediment? How to prevent the formation of sediment?
more information is necessary: how did you prepare the hypochlorous acid?
i dissolve calcium hypochlorite with water, and then filter the sediment. Take the flow through as hypochlorous acid.
I have no direct experience with calcium hypochlorite: what happens when you dissolve it in water? Maybe a precipitate of calcium hydroxide is formed, together with hypochlorous acid
In that case, your procedure would be correct. However, I would check the pH with a pH-meter: if the solution is alkaline (as I think), you are still working with hypochlorite and a correction of pH is needed. Adding a small amount of sulfuric acid may be of help: calcium sulfate precipitates, and hypochlorous acid is formed. This addition must be done with care: if an acidic local pH is obtained, chlorine may evolve.
i have included sulfamic acid acid as stabilizer of hypochlorus, and the final pH after adding hypochlorous and sulfamate is about 3.3. I thought that filter the calcium hypochlorite solution may remove the unwanted calcium. But it seems that the calcium hydroxide react with the citric acid buffer and precipitated out. Any idea to stabilize the calcium?
What is the reason of working with calcium hypochlorite instead of sodium hypochlorite?
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