Question

The titration of 22.80 mL of HCl solution of unknown concentration requires 12.34 mL of a 0.200 M NaOH solution to reach the equivalence point. What is the concentration of the unknown HCl solution in M?

Express your answer in moles per liter to three significant figures.

Answer 1

The concentration of the unknown HCl solution is 0.1093 M.

Step-by-step explanation:

To determine the concentration of the unknown HCl solution, we can use the equation:

HCl + NaOH → NaCl + H2O

From the balanced equation, we can see that the mole ratio of HCl to NaOH is 1:1.

Given that 12.34 mL of 0.200 M NaOH solution was required to reach the equivalence point with 22.80 mL of the HCl solution, we can set up the equation:

(0.200 M NaOH)(0.01234 L NaOH) = (unknown HCl concentration)(0.02280 L HCl)

Solving for the unknown HCl concentration, we get:

unknown HCl concentration = (0.200 M NaOH)(0.01234 L NaOH) / (0.02280 L HCl)

unknown HCl concentration = 0.1093 M

Answer 2

0.108 mol/L (to 3 s.f.)

Step-by-step explanation:

Please see the attached picture for full solution.