Ionic EquilibriumHard

Question

Which solution will have pH closer to 1.0:

Options

A.100 mL of (M/10) HCI + 100 mL of (M/10) NaOH
B.55 mL of (M/10) HCI + 45 mL of (M/10) NaOH
C.10 mL of (M/10) HCI + 90 mL of (M/10) NaOH
D.75 mL of (M/5) HCI + 25 mL of (M/5) NaOH

Solution

Meq. of HCI = 75 × = 15    Meq. of NaOH = 25 × = 5
∴  Meq. of HCI left  = 15 - 5 = 10    Now [HCI] left = = 10-1
∴  pH = 1

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