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Question Q124) What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 MBa(OH)2?



SOLUTION

Reaction
Ba(OH)2 + 2HCl2 → BaCl2 + 2H2O
Miliequivalnce of HCl = 20×0.05 = 1
Miliequivalnce of Ba(OH)2 = 2×30×0.1= 6 ( as charge on Ba =2 or Number of OH =2)
Thus 1 miliequivalce of HCl will be neutralized
And 5 miliequivalence of Ba(OH)2 will remain unreacted
But total volume =20+30 =50
Thus OH- concentration M
M = 5/50=0.1M
Answer : (b)