1. 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. 2. Consider the reaction: Fe (s) + Cu2+ (aq) ⇌ Fe2+ (aq) + Cu (s) If [Cu2+] = 0.50 M, what [Fe2+] is needed to increase Ecell by 0.10 V above E0cell at 20 °C?
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1. 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.
2.
Consider the reaction:
Fe (s) + Cu2+ (aq) ⇌ Fe2+ (aq) + Cu (s)
If [Cu2+] = 0.50 M, what [Fe2+] is needed to increase Ecell by 0.10 V above E0cell at 20 °C?
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