All u nid to kno abt salts Flashcards
Soluble salts
all soluble
(NO3 CH3COOH)
(K Na NH4)
Cl (Exp PAH)
SO4 (Exp PABC)
all insoluble Exp all soluble
(CO3, Pb )
preparation for insoluble salts
Double decomposition reaction
- Choose a soluble salt solution containing cation of the insoluble salt
- Choose a soluble salt solution containing anion of the insoluble salt
- Mix two solutions
- Filter, wash and dry the precipitate
preparation for soluble salts
not K Na NH4
acid metal
acid metal oxide
acid metal hydroxide
acid metal carbonate
- Add excess solid to hot dilute acid
- Filter off the unreacted solid
- Evaporate to saturate the salt solution
- Cool to allow crystallisation to occur
- Filter, wash and dry crystals
preparation for soluble salts
K Na NH4
Neutralisation reaction
- Use titration method to neutralise a given volume of acid to obtain the salt solution
- Evaporate to saturate the salt solution
- Cool to allow crystallisation to occur
- Filter, wash and dry the crystals
solid zinc oxide
yellow when hot
white when cold
solid lead2 oxide
brown when hot
yellow when cold
chromate 6 ion
yellow
Chromium3 ion is green
dichromate 6 ion
orange
manganate7 ion
purple
iron 2 ion
green
iron 3 ion
brown
copper 2 ion
blue
lead 2 chloride
lead 2 bromide
lead 2 iodide
insoluble in cold water
soluble in hot water
iron2 ions
nickel2 ions
chromium3 ion
dissolve in water to produce green solutions
test for ammonia gas
bring a piece of moist red litmus paper to the mouth of the tt
(red litmus paper turns blue)