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Science Quiz / Qualitative Analysis

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Can you name the chemical present?

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test & resultchemical
bleaches damp litmus paper
aq. ammonia = red-brown ppt., insol.
aq. sodium hydroxide = white ppt., soluble in excess
aq. sodium hydroxide = green ppt., insol. in ex.
'pops' with a lighted splint
aq. sodium hydroxide = green ppt., insol. in ex.
aq. sodium hydroxide = white ppt., solub. in ex., colourless sol.
aq. ammonia = white ppt., insol. in ex.
add aqueous sodium hydroxide, then aluminum foil; warm carefully = ammonia produced
aq. ammonia = light blue ppt., sol. in ex. gives dark blue solution
aq. ammonia = white ppt., solub. in ex., colourless sol.
aq. sodium hydroxide = ammonia produced on warming
test & resultchemical
damp red litmus paper turns blue
add dilute acid = effervescence, carbon dioxide produced
Ca(OH)2 (lime water) becomes milky
acidify with dillute nitric acid, then add aqueous lead(II) nitrate = yellow ppt.
aq. sodium hydroxide = white ppt., insol. in ex.
acidify, then add aqueous barium nitrate = white ppt.
relights a glowing splint
aq. sodium hydroxide = light blue ppt., insol. in ex.
aq. sodium hydroxide = red-brown ppt., insol.
acidify with dilute nitric acid, then add aqueous silver nitrate = white ppt
aq. ammonia = no or slight ppt.
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