Step 2: above the solubility rules linked over to identify whether every substance will certainly dissociate:

2 HI+


BaI2+2 H2O




Step 3: Dissociate all soluble salts, solid acids, and strong bases (except calcium hydroxide). Leave with each other all "not soluble" salts and also weak acids or bases. Note that when H3O+ loses a proton, a water molecule is formed.

2H3O+ (aq) + 2I- (aq) + Ba2+ (aq) + 2OH- (aq)Ba2+ (aq) + 2I- (aq) + 4 H2O (l)

Step 4: Cross out "spectator ions" that show up on both political parties of the reaction (these ions do not take part in the chemistry) and rewrite the "net" reaction making use of the smallest feasible coefficients.

H3O+ (aq) + OH- (aq) 2 H2O (l)

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