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Q.

Which of the following statements is/are correct? 20.0 mL of 6.0 M HCI is mixed with 50.0 mL of 2.0 MBa(OH)2, and 30 mL of water is added.

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a

The concentration of O⊝H remaining in solution is 0.8 M.

b

The concentration of Cl⊝ remaining in solution is 1.2M.

c

The concentration of Ba2+ remaining in solution is 1.0M

d

80 mmoles of O⊝H is in excess

answer is A.

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Detailed Solution

mmoles of HCl⇒20×6=120⇒120 mmol H⊕+120 mmolCl⊝ mmoles of Ba(OH)2⇒5×2=100⇒100 mmol Ba2++200 mmol O⊝H H⊕+O⊝H→ H2O Total volume = 20+50+30=100 mL 1. âˆ´ O⊝H=(200−120) mmol100 mL=0.8 M2. Cl⊖=120 mmol100 mL=1.2M3. Ba2+=100 mmol100 mL=1.0M 4. mmoles of  O⊝H left = 200-120=80 mmol
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