Answer: The volume of concentrated acid added will be 4.26 ml
Step-by-step explanation:
The expression used will be dilution law:
where,
= concentration of stock
= 6.00 M
= concentration of resulting
= 0.341 M
= volume of stock
= ?
= volume of resulting
= 75.0 ml
Now put all the given values in the above law, we get the volume of stock
added

By solving the terms, we get :

Therefore, the volume of concentrated acid added will be 4.26 ml