Verified Answer :

The mole number of the solute after dilution is constant. So the mole number of 319 ml of 6.80 M HCl is 6.8031910^(-3)=2.17 mol. So the  volume of 6.00 M HCl needed is 2.17/6.00=0.362 L=362 ml.

Answer : The volume of 6.00 M HCl needed are, 361.5 ml

Solution :

According to the neutralization law,

\(M_1V_1=M_2V_2\)

where,

\(M_1\) = molarity of HCl solution = 6.00 M

\(V_1\) = volume of HCl solution = ?

\(M_2\) = molarity of another HCl solution = 6.80 M

\(V_2\) = volume of another HCl solution = 319 ml

Now put all the given values in the above law, we get the volume of HCl solution.

\((6.00M)\times V_1=(6.80M)\times (319ml)\)

\(V_1=361.5ml\)

Therefore, the volume of 6.00 M HCl needed are, 361.5 ml