ANSWERS: 1
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20.0 mL x 0.130molHCl/L = 2.60 mmol HCl mol H+ = mmol HCl = 2.60 mmol H+ 20.0 mL x 0.120molBa(OH)2 = 2.40 mmol Ba(OH)2 mmol OH- = 2(mmol Ba(OH)2) = 4.80 mmol OH- Since H+ and OH- react in a 1:1 fashion... mmol of OH- unreacted = 4.80 mmol-2.60 mmol =2.20 mmol OH- [OH-] after mixing = 2.20 mmol/40.0 mL = 5.05M OH- pOH = -log[OH-] = -log(5.05) = 0.703 pH = 14.000 - 0.703 = 13.297 You could convert all the mL to L and save yourself the grief of the millimole, but I was feeling lazy so I didn't.
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