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47 In a titration, 20.0 milliliters of a 0.150 M NaOH(aq) solution exactly neutralizes 24.0 milliliters of an HCl(aq) solution. What is the concentration of the HCl(aq) solution?(1) 0.125 M (3) 0.250 M
(2) 0.180 M (4) 0.360 M
The answer is (1) 0.125 M. The reaction equation is NaOH + HCl = NaCl + H2O. So the mol number of NaOH and HCl is the same. So suppose the concentration of HCl is x, we can have equation: 20*1.15=24*x. So x= 0.125 M. (M means mol/L, but if we use the same unit at both side of the equation, it is ok.)
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