In a titration 5.0 mL of a 2.0 M NaOH aq solution exactly neutralizes 10.0 of an HCL aq solution what is the concentration of the HCL (aq) solution

The concentration of HCl solution is calculated as follows

write the equation for reaction

NaOH + HCl = NaCl + H2O

find the moles NaOH = molarity x volume / 1000

= 5 x2/1000 = 0.01 moles

by use of mole ratio between NaOh to HCl which is 1 : 1 the the moles of Hcl is also = 0.01 moles

concentration is therefore = moles/volume x1000

= 0.01/10 x1000 = 1M