7. A Na₂CO₃standard solution is prepared by transferring4.9634 grams of primary standard- grade sodium carbonate to a 500.0-mL volumetric flask, dissolving the sample in ~100 mL of distilled deionized water and diluted to the mark. A 50.00-mL aliquot is taken and titrated with 85.30 mL of HCl solution. Calculate the concentration of the HCl solution. (The molecular mass of Na₂CO₃ is 105.99 g/mol.)
(A) 0.0549 M
(B) 0.1098 M
(C) 0.1598 M
(D) 0.1997 M
(E) 0.3196 M