[allo_321]

(i) Dilute acetic acid is added to solid nickel (II) carbonate.
2CH₃COOH_(aq) + NiCO_3(s) ------> (CH₃COO)_2(?)Ni + H₂CO_3(?)

(ii) Concentrated solutions of calcium nitrate and sodium hydroxide are combined.
Ca(NO₃)_2(aq) + 2NaOH_(aq) ------> Ca(OH)₂ + 2NaNO₃

(iii) Concentrated solutions of mercury (II) nitrate and sodium iodide are combined.


hi guys.. im stuck on the balanced equation firstly.. i've written what i THINK the full balanced equations.. im also confused about the states if u could plz help me with those too!!

thank you so much!

[allo_321]

sorry i forgot to write the equation for the last one...

Concentrated mercury (II) nitrate + sodium iodide...

Ag(NO₃)_2(aq) + 2NaI_(?) ----> AgI_2(?) + 2NaNO_3(aq)

once again im not sure of the states..

as for the balanced ionic equations.. for the first one.. im not sure how to do :S

the second one:

Ca²⁺_(aq) + 2NO₃^1-_(aq) + 2Na ¹⁺_(aq) + 2OH ^1-_(aq) --------> 2Na¹⁺_(aq) + 2NO₃^1-_(aq) + Ca²⁺_(aq) +2OH^1-_(aq)

which results in...

Ca²⁺_(aq) + 2NaOH^1-_(aq) ------> CaOH_(aq) + Na_(aq)

lol... i have a good feelings its wrong because i only got half a mark for this question...

as for the third part.. i got it completely wrong.. so thanks for whatever help you can give me

[Sev]

Concentrated mercury (II) nitrate + sodium iodide...

Ag(NO₃)_2(aq) + 2NaI_(?) ----> AgI_2(?) + 2NaNO_3(aq)

Mercury is not Ag.  As for states, try checking HgI₂ solubility.

[allo_321]

Hg.. thats right. my bad  ...

i have my exam coming up this week and im having trouble remembering the solubility rules, any ideas?