ANSWER
The final concentration of HCl is 0.0833 M
EXPLANATION
Given that;
The initial volume of HCl is 25.0mL
The final volume of HCl is 31.5mL
The initial concentration of HCl is 0.105 M
Apply the dilution formula to find the final concentration of HCl
[tex]\text{ C1 V1 = C2 V2}[/tex]Substitute the given data into the above formula
[tex]\begin{gathered} \text{ 0.105 }\times\text{ 25 }=\text{ 31.5 }\times\text{ C2} \\ \text{ 2.625 = 31.5 C2} \\ \text{ Divide both sides by 31.5} \\ \text{ }\frac{2.625}{31.5}\text{ = C2} \\ C2\text{ = 0.0833 M} \end{gathered}[/tex]Therefore, the final concentration of HCl is 0.0833 M
