[54321]

i just want someone to explain to me how to write product equation for chemical reaction.
One of examples is:
barium chloride reacts with hydrogen phosphate to form....
hope u can explain this to me

[dexangeles]

here's a hint: u have cations and anions --- first you need to figure out what consists of Barium Chloride, and Hydrogen Phosphate.  Phosphate is a polyatomic ion.

show us what you've done so far, and we'll help you through it

[54321]

here's a hint: u have cations and anions --- first you need to figure out what consists of Barium Chloride, and Hydrogen Phosphate.  Phosphate is a polyatomic ion.

show us what you've done so far, and we'll help you through it

i dont know if its right though
BaCl2+H3PO4->
then what should i do?

[Mitch]

I'll give you one product and you figure out the other: HCl

[dexangeles]

you're on the right track --- Mitch gave you one product already as a hint
just think of CATIONS and ANIONS

[AWK]

This is quite complex problem
BaCl2 + Na2HPO4 = BaHPO4(s) + 2NaCl

If some ammonia is present in solution (in qualitative analysis of cations NH3 is always present at this step)

3BaCl2 + 2Na2HPO4 + 2NH3 = Ba3(PO4)2(s) + 2NH4Cl + 4NaCl


Mitch, HCl cannot be formed during reaction because a very weak acid (HPO4(2-)) cannot replace the strong one (HCl)
Of course, there are some examples when even weak acid replace the strong one, but then a powerful driving force will work, ie in H2S acid solution a concentration of S(2-) is sufficient to precipitate HgS

[dexangeles]

I didn't expect HS Chemistry to be that detailed AWK  

my thoughts where basic reaction w/ equilibrium pointing towards the reactants

[Mitch]

I stand corrected, thanks for catching it.

[pizza1512]

Check the reactivity series....