Group 2+7 (L) Flashcards
What reagent is used for AgCl
1) Dilute NH3
2) AgCl ppt dissolves
3) AgCl(s) + 2NH3(aq) -> [Ag(NH3)2]-(aq) + Cl-
What reagent is used for AgBr
1) conc NH3
2) AgBr ppt dissolves
3) AgBr(s) + 2NH3(aq) -> [Ag(NH3)2]-(aq) + Br-
What molecules react with Br water
1) Alkenes
2) Orange -> colourless
3) electrophilic addition of Br2 to alkene
What molecules react with sodium carbonate
1) Carboxylic acids
2) effervescence
3) formation of CO2
What reagent is used for Ba2+
1) H2SO4
2) White ppt
3) formation of BaSO4
4) Ba2+(aq) + SO42-(aq) -> BaSO4(s)
What reagent is used for OH-
1) MgCl2
2) white ppt
3) formation of Mg(OH)2(s)
4) Ag+(aq) + Br-(aq) -> AgBr(s)
What reagent is used for l-
1) AgNO3
2) yellow ppt
3) AgI (s) forms
4) Ag+(aq) + I-(aq) -> AgI(s)
What molecules react with Tollens reagent
1) Aldehydes
2) silver mirror forms
3) Ag+ in tollens reduced to Ag when aldehyde oxidised
What reagent is used for SO42-
1) BaCl2
2) White ppt
3) formation of BaSO4
4) Ba2+(aq) + SO42-(aq) -> BaSO4(s)
What reagent is used for Mg2+
1) NaOH
2) white ppt
3) formation of Mg(OH)2(s)
4) Mg2+ (aq) + 2OH-(aq) -> Mg(OH)2(s)
What reagent is used for CO32-
1) any acid (HNO3 best)
2) effervescence
3) CO2 forms
4) Acid + carbonated base -> salt +h2o + CO2
What reagent is used for NH4+
1) NaOH + heat
2) red litmus to Blue
3) NH3(g) forms
What molecules react with fehlings solution
1) Aldehydes
2) Brick red ppt
3) fehlings reduced when aldehyde oxidised
What molecules react with acidified K2Cr2O7
1) 1st+2nd alcohols+aldehydes
2) Orange -> Green
3) Cr2O7 2- reduced to Cr3+ when alco+alde oxidised
what reagent is used for Br-
1) AgNO3
2) cream ppt
3) AgBr (s) forms
4) Ag+(aq) + Br-(aq) -> AgBr(s)
