Question 11.11: Write the balanced equation for the neutralization of HCl(aq...

Write the balanced equation for the neutralization of HCl(aq) and Ba(OH)_{2}(s).

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STEP 1  Write the reactants and products.

HCl(aq) + Ba(OH)_{2}(s) → H_{2}O(l) + salt

STEP 2  Balance the H^{+} in the acid with the OH^{-} in the base. Placing a coefficient of 2 in front of the HCl provides 2H^{+} for the 2OH^{-} from Ba(OH)_{2}.
2HCl(aq) + Ba(OH_{2})(s) → H_{2}O(l) + salt

STEP 3  Balance the H_{2}O with the H^{+} and the OH^{-}. Use a coefficient of 2 in front of H_{2}O to balance 2H^{+} and 2OH^{-}.
2HCl(aq) + Ba(OH)_{2}(s) → 2H_{2}O(l) + salt

STEP 4  Write the salt from the remaining ions. Use the ions Ba^{2+} and 2Cl^{-} and write the formula for the salt as BaCl_{2}.
2HCl(aq) + Ba(OH)_{2}(s) → 2H_{2}O(l) + BaCl_{2}(aq)

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