Flashcards
Qualitative Analysis: Tests for cations and anions
Flashcards do conjunto (22)
- 1aq.NaOH: Dirty green ppt, insoluble in excess, turned reddish brown on standing in air.\[Fe^{2+} \]
- 2aq.\(NH_3\) : Dirty green ppt, soluble in excess, dirty green solution.\[Fe^{2+} \]
- 3aq.NaOH: Reddish-brown ppt, insoluble in excess.\[Fe^{3+} \]
- 4Salt solution: Dark yellow. Aq.\(NH_3\) : Reddish brown ppt, soluble in excess, reddish-brown solution.\[Fe^{3+} \]
- 5Salt solution: Pale blue. Aq.NaOH: blue ppt, insoluble in excess.\[Cu^{2+} \]
- 6Salt solution: Pale blue. Aq.\(NH_3\) : Blue ppt, soluble in excess, dark blue solution.\[Cu^{2+} \]
- 7aq.NaOH: White ppt, insoluble in excess.\[Ca^{2+} \]
- 8aq.\(NH_3\) : No visible reaction.\[Ca^{2+} \]
- 9aq.NaOH: White ppt, soluble in excess, colourless solution.\(Zn^{2+} \), \(Al^{3+} \), \(Pb^{2+} \) may be present
- 10aq.\(NH_3\) : White ppt, soluble in excess, colourless solution.\[Zn^{2+} \]
- 11aq.\(NH_3\) : White ppt, insoluble in excess.\(Al^{3+} \), \(Pb^{2+} \) may be present
- 12aq.NaOH: No visible reaction. When warmed, colourless and pungent gas turns red litmus paper blue.\[NH_4^+ \]
- 13\(Al^{3+} \), \(Pb^{2+} \) may be present. KI: No visible reaction.\[Al^{3+} \]
- 14\(Pb^{2+} \), \(Al^{3+} \) may be present. KI: Yellow ppt, insoluble in excess, some ppt dissolves when warmed, golden-yellow crystals form when cooled under running water.\[Pb^{2+} \]
- 15Dilute acid: Effervescence, gas evolved forms white ppt in limewater.\(CO_2\) evolved.
\(CO_3^{2-} \) ions present. - 16Aqueous \(Ba(NO_3)_2\): White ppt. Dilute \(HNO_3\) : White ppt, insoluble in diulte \(HNO_3\).\(SO_4^{2-}\)
- 17Aq. \(AgNO_3\) : White ppt. Dilute \(HNO_3\): White ppt, insoluble in dilute \(HNO_3\). Aq. \(NH_3\) : Soluble in aq. \(NH_3\) , colourless solution\(Cl^- \)
- 18aq. \(Pb(NO_3) _2\) : Yellow ppt. Dilute \(HNO_3\): Yellow ppt insoluble in dilute \(HNO_3\). Heat mixture till solid dissolves. Cool under tap: Yellow ppt dissolves, golden-yellow crystals form.\(I^- \)
- 19aq. NaOH: Colourless solution. Devarda's alloy or Zn / Al powder. Heat gently: Vigorous effervescence observed. Colourless and pungent gas evolved turns red litmus paper blue.\(NH_3\) gas evolved, \((NO_3)^- \) ions present
- 20aq.\(BaCl_2\): White ppt. Dilute HCl: ppt insoluble in acid.\(SO_4^{2-}\)
- 21aq.\(AgNO_3\): Yellow ppt. Aq.\(HNO_3\): ppt insoluble in acid. Aq.\(NH_3\): ppt insoluble in aq. \(NH_3\)\(I^- \)
- 22aq. \(Pb(NO_3) _2\) : White ppt. Dilute \(HNO_3\): Ppt insoluble in dilute acid. Heat mixture till solid dissolves, cool under tap: Ppt dissolves when heated to form colourless solution, reappears as shiny white crystals upon cooling.\(Cl^- \)