we r almost there actually.
start to think from BaCO3 + H2SO4

This mean BaSO4 is not soluble in WATER but soluble in acid..

Just look again the sentence "The salt produced can be dissolaved by adding?"
It means what ?

BaSO4 is only soluble in HNO3 or HCl.

from what i understood..it mean that the salt produced later must be a soluble salt

Another word, "BaCO3 produced can be dissolved by adding ?"

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Added on November 8, 2008, 10:44 pmreally ?
That wasn't my understanding.
For me, it means which one can dissolve BaCO3

This post has been edited by work_tgr: Nov 8 2008, 10:44 PM

tis mean what?

Y it is just soluble in HNO3 or HCl?

this means only acid lah ... and it doesn't mean the products must be in solution.

This post has been edited by work_tgr: Nov 8 2008, 10:47 PM

Check wiki http://en.wikipedia.org/wiki/Barium_carbonate

Barium carbonate reacts with many acids to soluble barium salts, for example barium chloride:

BaCO3(s) + 2 HCl(aq) → BaCl2(aq) + CO2(g) + H2O(l)

However the reaction with sulfuric acid is poor, because barium sulfate is highly insoluble.

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Added on November 8, 2008, 10:46 pmBecause BaSO4 is an insoluble salt.

This post has been edited by raptor_cZn: Nov 8 2008, 10:46 PM

I think that statement is under the properties of sulphate salt.

so confuse lah..so how i do tis ques..? see what?

Ok thx..Forget that acid+metal carbonate -> salt+CO2+H2O

Maybe you can try to find out how BaCO3 react with item A, B, C ?

That's why I said, only acid is able to remove carbonate ions.
Regardless, the question set is not good, that's all I can say.

Displacement reaction will be a metal replacing a solution of a metal salt.
Eg : Mg + CuSO₄ -> MgSO₄ + Cu

The reaction for B
http://wiki.answers.com/Q/Ionic_Equation_f...odium_carbonate

Yeah. Good final conclusion.

why not good leh..mind to explain?

If they want to get a soluble salt this is the reaction

Ba(Cl)2(aq) + Na2CO3(aq) = 2NaCl(aq) + BaCO3(aq)

How come the reactants is Ba(Cl)2(aq) + Na2CO3(aq) ?
This question's reactant is BaCO3