Ross attempted to titrate 30.0 mL of NaOH solution with 1.0 M HCl solution. The flask of NaOH solution contained 0.00300 mole of NaOH. Ross carelessly added 5.0 mL of HCl solution to the NaOH and observed blue litmus paper in the flask turn pink. What was the hydrogen ion concentration in the flask after all the HCl was added?
A
1.0 × 10-7 mol/L

B
2.0 × 10-3 mol/L

C
5.7 × 10-2 mol/L

D
6.7 × 10-2 mol/L