Precipitate Comparison Test; Borax and Sea Salt with Calcium Silicate

I perform a quick precipitate comparison between borax and sea salt with calcium silicate. The difference is startling to say the least.





I note that much of the precipitate has got to be the eroded material from one of the plates. This can only mean that there is a high concentration of Chromium in the sea salt sample and a simple 1/4 teaspoon of ferrous sulfate will not be enough to reduce the Cr(VI) to Cr(III).

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