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25 ml of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30 mL of 0.2 M aqueous NaOH solution?

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25 mL

50 mL

12.5 mL

75 mL

answer is A.

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Detailed Solution

I HCl
V_a = 25 ml
N_a = ?
Na₂CO₃
V_b = 30ml
M_b = 0.1M
n_b = 2
V_aN_a = V_bN_b
25N_a = 30(0.1)2
N_a = 6/25 N
II HCl
V_a = ?
N_a = 6/25
NaOH
V_b = 30ml
M_b = 0.2M
n_b = 1
V_aN_a = V_bN_b
V_a(6/25) = 30(0.2)1
V_a = 25 ml

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