1) All of my procedures were correct except for my Potassium Dichromate combined with the copper chloride I believe that the outcome for this was different from what was originally chosen because the two substances mixed didn't cause any precipitation to happen.
2) Something that is removed from waste water before it is proceeded back to nature is a pump. It gets all of the sediments out of the water. Sulfide is insoluble which means it is a precipitant.
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