(Chemistry heads)What happens through the cbservation process when?

Question

1) leadnitrate is heated 2)ammonium chloride is heated 3)coppersulphate is heated 4)aqueos coppersulphate is combined with aqeous ammonia 5)aqeuos coppersulphate is combined with sodium hydroxide 6)magnesium combined with coppersulphate solution and 7)sodium combined with water........please help i just want 2 make sure what i have is correct.

I'm in Jamaica

Answer 1

try Vogel's "Qualitative Inorganic Analysis", I'm pretty sure it has all the answers 4 u.

dont care editions, but for 7th ed, ISBN is 0582218667

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okey then, from Vogels

1) when heated, lead nitrate decomposes to white solid lead oxide (PbO), brown gas (NO2) and oxygen gas. Brown gas decolorizes when contact with water.

2) ammonia odur. ammonium compounds are all volatile towards heat and decomposes to ammonia and an acid but quickly recombine if the acid, in this case, hydrochloric acid, is a strong acid.

3) anhydrate copper sulphate is white, hydrate copper sulphate is blue. I have no idea which one you actually heated. If it's anhydrate, no change; if hydrate, blue ---> white.

4) blue precipitate forms initally, but resolve upon excess reagent, clear blue soln results due to the formation of copper complex [blue precipitate: Cu(OH)2*CuSO4, complex: [Cu(NH3)4]^2+]

5) brown precipitates froms [Cu(OH)2], no change with excess reagents.

6) metal-gray stipe (magnesium stipe) gains a redish brown color due to formation of copper metal. Possible decolorization of the soln (depends on how much magnesium u actually put in)

7) volatile reaction, solid metal solves,ignitable gas is formed. (if phenolphthalein is added to water initally, soln becomes pink)

Answer 2

1.) Lead nitrate will have to be heated tremendously, but it will eventually give off NO2 gas and leave PbO behind (assuming it's lead (II))

2.) Ammonium chloride will split into ammonia gas and hydrogen chloride gas.

3.) Copper sulfate, too, will have to be heated tremendously, but it could give off SO3 gas and leave CuO, or that might only be with copper sulfite, check your J.S. Bach reaction table.

4.) Copper+2 will create complex ions with ammonia.

5.) Copper hydroxide will precipitate.

6.) single replacement between the Mg and Cu+2

7.) hydrogen gas is produced (huge explosion afterwards, lots of fun, provided you're not too close)

Answer 3

well ther're are gases relaesed like bubbles coming off...
And the sodium metal will spin in water producing bubbles like hydrogen gas