Cations and Anions Composition

Confirmatory Tests to get Cations & Anions

made by alex teoh / Update: 29 December 2004-2205 they would / very first pub: several Sep 2001 @ CHIJ-St Joseph's Convent

Test pertaining to CATions

* All cations must be within aqueous claims before assessments can be done..

CATion

ammonium zinc

Reaction with aqueous Sodium Hydroxide

NO ppt. Ammonia gas produced on warming. White ppt. [y] Soluble excessively aq. NaOH to form a colorless solution. [z] Zn2+ + 2OH- пѓЁ Zn(OH)2 (white ppt) Zn(OH)2 + 2OH- пѓЁ[Zn(OH)4]2- (aq) White ppt. [u] Ca2+ + 2OH- пѓЁ Ca(OH)2 (white ppt) Insoluble excessively aq. NaOH. [w] White-colored ppt. [p] Soluble in excess aq. NaOH to form a colorless solution. [q] Al3+ + 3OH- пѓЁ Al(OH)3 (white ppt) Al(OH)3 + OH- пѓЁ[Al(OH)4]- (aq) White ppt. Soluble excessively aq. NaOH to form a colorless solution. Pb2+ + 2OH- пѓЁ Pb(OH)2 (white ppt) Pb(OH)2 + 2OH- пѓЁ[Pb(OH)4]2- (aq) ZERO ppt.

Response with aqueous Ammonia

White-colored ppt. Soluble in excess aqueous ammonia to form a colorless solution. Zn2+ + 2OH- пѓЁ Zn(OH)2 (white ppt) Zn(OH)2 + 4NH3(aq) пѓЁ[Zn(NH3)4]2+ (aq) NO ppt. [x] or maybe a very minor white ppt. White ppt. [s] Absurde in excess aqueous ammonia. [t] Al3+ + 3OH- пѓЁ Al(OH)3 (white ppt) White-colored ppt. Absurde in excess aqueous ammonia. Pb2+ + 2OH- пѓЁ Pb(OH)2 (white ppt) Blue ppt.[i] Soluble excessively aqueous hydrogen to form a darker blue option. [m] Cu2+ + 2OH- пѓЁ Cu(OH)2 (blue ppt) Cu(OH)2 & 4NH3(aq) пѓЁ[Cu(NH3)4]2+(aq) Dark green ppt. Insoluble in excess aqueous hydrogen. Reddish-Brown ppt. Insoluble in excess aqueous phosphate.

calcium

aluminum

lead(II)

copper mineral (II)

Blue ppt. [g] Insoluble in excess aq. NaOH. Cu2+ + 2OH- пѓЁ Cu(OH)2 (blue ppt) Dark green ppt. [h] Insoluble excessively aq. NaOH. Fe2+ & 2OH- пѓЁ Fe(OH)2 (dark green ppt) Reddish-Brown ppt. [k] Absurde in excess aq. NaOH. Fe3+ + 3OH- пѓЁ Fe(OH)3 (red darkish ppt)

flat iron (II) iron(III)

NOTE: The observations pertaining to both lead(II) and aluminium ions are very similar. To distinguish all of them, add aqueous potassium iodide KI to both solutions....



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