Testing for Al3+ ions. When 1M ammonium hydroxide (NH4OH) is poured into a beaker with 0.25M aluminium sulphate (Al2(SO4)3), gelatinous white precipitate of aluminium hydroxide (Al(OH)3) is formed. The reaction is Al2(SO4)3 + NH4OH -> Al(OH)3 + (NH4)2SO4. This reaction had been used as a test for Al3+ ions in classic qualitative inorganic analysis. | |
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Credit: | Science Photo Library / Science Source / Turtle Rock Scientific |
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