Tests For Common Cations Flashcards
Aluminium Al3+
Add AQUEOUS SODIUM HYDROXIDE dropwise 》》》 WHITE PRECIPITATE formed dissolves in EXCESS.
//////
Add AQUEOUS AMMONIA dropwise 》》》 WHITE PRECIPITATE formed does NOT dissolve in excess.
Calcium Ca²+
Add concentrated AQUEOUS SODIUM HYDROXIDE》》》 THIN WHITE PRECIPITATE of CALCIUM HYDROXIDE
Ammonium NH4+
Add AQUEOUS SODIUM HYDROXIDE 》》》 PUNGENT SMELL OF AMMONIA GAS which turns RED LITMUS BLUE.
Copper(II) Cu²+
Add AQUEOUS SODIUM HYDROXIDE 》》》 PALE BLUE GELATINOUS PRECIPITATE
////
Add AQUEOUS AMMONIA dropwise 》》》 (w/excess ammonia) DEEP BLUE COLOURED SOLUTION
Iron(II) Fe²+
Add AQUEOUS SODIUM HYDROXIDE 》》》 PALE GREEN GELATINOUS PRECIPITATE
//(both do not dissolve in excess and are the same)
Add AQUEOUS AMMONIA 》》》 PALE GREEN GELATINOUS PRECIPITATE
Iron(III) Fe³+
Add AQUEOUS SODIUM HYDROXIDE 》》》 RED-BROWN GELATINOUS PRECIPITATE
//// (Both same)
Add AQUEOUS AMMONIA 》》》 RED-BROWN GELATINOUS PRECIPITATE
Zinc Zn²+
Add AQUEOUS SODIUM HYDROXIDE dropwise 》》》WHITE PRECIPITATE first formed then in EXCESS, a COLOURLESS SOLUTION
//// (Same for both)
Add AQUEOUS AMMONIA 》》》WHITE PRECIPITATE first formed then in EXCESS, a COLOURLESS SOLUTION.
Chromium Cr³+
Add NaOH 》》》 GREEN PRECIPITATE
EXCESS NaOH 》》》 DARK-GREEN SOLUTION
////
Add NH3 》》》 GRAY-GREEN PRECIPITATE which is insoluble in excess
Add AQUEOUS SODIUM HYDROXIDE dropwise 》》》 WHITE PRECIPITATE formed dissolves in EXCESS.
//////
Add AQUEOUS AMMONIA dropwise 》》》 WHITE PRECIPITATE formed does NOT dissolve in excess.
Aluminium Al3+
Add concentrated AQUEOUS SODIUM HYDROXIDE》》》 THIN WHITE PRECIPITATE of CALCIUM HYDROXIDE
Calcium Ca²+
Add AQUEOUS SODIUM HYDROXIDE 》》》 PUNGENT SMELL OF AMMONIA GAS which turns RED LITMUS BLUE.
Ammonium NH4+
Add AQUEOUS SODIUM HYDROXIDE 》》》 PALE BLUE GELATINOUS PRECIPITATE
////
Add AQUEOUS AMMONIA dropwise 》》》 (w/excess ammonia) DEEP BLUE COLOURED SOLUTION
Copper(II) Cu²+
Add AQUEOUS SODIUM HYDROXIDE 》》》 PALE GREEN GELATINOUS PRECIPITATE
//(both do not dissolve in excess and are the same)
Add AQUEOUS AMMONIA 》》》 PALE GREEN GELATINOUS PRECIPITATE
Iron(II) Fe²+
Add AQUEOUS SODIUM HYDROXIDE 》》》 RED-BROWN GELATINOUS PRECIPITATE
//// (Both same)
Add AQUEOUS AMMONIA 》》》 RED-BROWN GELATINOUS PRECIPITATE
Iron(III) Fe³+
Add AQUEOUS SODIUM HYDROXIDE dropwise 》》》WHITE PRECIPITATE first formed then in EXCESS, a COLOURLESS SOLUTION
//// (Same for both)
Add AQUEOUS AMMONIA 》》》WHITE PRECIPITATE first formed then in EXCESS, a COLOURLESS SOLUTION.
Zinc Zn²+
