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A beaker containing HCl solution is neutralized with 0.7 M KOH solution. What do you know about the ratio [H3O]+/[OH]-in the reaction mixture at the end point?
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The same HCl solution can also be neutralized with 0.7 M Ca(OH)2 solution. What would be the ratio [H3O]+/[OH]- in the reaction mixture at the end point in this case?
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1) HCl + KOH -> H2O + KCl
neutralized means pH = 7 this means [H3O+] = [OH-]
[H3O+]/[OH-] = 1
2)if you use the same amount of HCl as in 1) you get:
HCl + Ca(OH)2 -> Ca2+ + Cl- + H2O+ OH-
that means we have more OH- than H3O+ in the solution and the ratio is >1, the pH will be over 7
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