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Explain why 6M NH 3 and not 6M NaOH solution is used when separation Fe 3+ and Al 3+ ions from Ca 2+ , Cu

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Explain why 6M NH3 and not 6M NaOH solution is used when separation Fe3+ and Al3+ ions from Ca2+, Cu2+, and K+ ions in the qualitative analysis of cations. Write appropriate chemical equations to support your conclusion.

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