Question

The concentration of 20 mL of HCl is determined by titrating with NaOH. The titration reaches its endpoint after adding 10.1 mL of 0.859 M NaOH. What was the original concentration of the HCl

Answer 1

Step-by-step explanation:

The reaction equation for this reaction is as follows.

`NaOH + HCl \rightarrow NaCl + H_(2)O`

The given data is as follows.

`M_(1)` = ?,
`V_(1)` = 20 ml

`M_(2)` = 0.859 M,
`V_(2)` = 10.1 ml

Hence, we will calculate the original concentration of HCl as follows.

`M_(1)V_(1) = M_(2)V_(2)`

`M_(1) * 20 ml = 0.859 M * 10.1 ml`

`M_(1)` = 0.434 M

Thus, we can conclude that the original concentration of the HCl is 0.434 M.