Assertion: aluminum hydroxide | /r/CreatedBy | such precipitation
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text: It has also been discovered: that the use of sodium carbonate, sodium hydroxide, or ammonium hydroxide as precipitants for aluminum hydr xide from aluminum is not effective for producing a illterable aluminum hydroxide which can be purified by washing, and therefore aluminum hydroxide made by such precipitation does not fall within the scope of the precipitated from aluminum sulfate by the just enumerated alkalies is pasty and very diflicult to filter.