The Ba(OH)2 dissociates as Ba^(+2) + 2 OH^(-). H2SO4 dissociates as 2 H^(+) + SO4^(-2).
Write a balanced equation for this reaction.

Supposing "this reaction" to be the reaction between barium hydroxide and sulfuric acid:

Ba(OH)2 + H2SO4 → BaSO4(s) + 2 H2O

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

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