Make a solution of the unknown substance: add sodium hydroxide solution or ammonium hydroxide solution, make observations and give your deduction. Warming the mixture may be needed. Choose from substances containing Ca2+, Cu2+, Fe2+, Fe3+, Pb2+, Zn2+, NH4 + .
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Every year, biopharmaceutical production facilities use vast quantities of Cleaning-In-Place (CIP) solutions to maintain the purity of their manufacturing equipment.
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