Question

Calculating the concentration of excess HCL in E ?

Answer 1

Well, you have got us here mate....

Explanation:

I presume that you performed an acid base reaction with a known amount of `HCl(aq)`...and this reacts with your base according to the equation....

`M(OH)_2(s) + 2HCl(aq) rarr MCl_2(aq) + 2H_2O(l)`

The acid in excess is then titrated with `NaOH(aq)` of KNOWN concentration....we can thus get back to the concentration or molar quantity of `M(OH)_2`...as it stands the question (and answer) are hypothetical...