When 32.3 mL of 0.100 M Ba(OH)2 is mixed with 197.2 mL of 0.200 M HCl, the reaction goes to completion. Calculate the pH of the solution.

Chemistry & Chemical Reactivity
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Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria
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When 32.3 mL of 0.100 M Ba(OH)2 is mixed with 197.2 mL of 0.200 M HCl, the reaction goes to completion. Calculate the pH of the solution.

 

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The reaction result in the formation of Barium chloride. The pH of a solution is the negative logarithm of H+ ion concentration or 14 subtracted from the negative logarithm of OH+ ion concentration. So here the pH can be calculated  either from the amount of HCl or Ba(OH)2 that remains after the reaction.

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