Answer :
Answer : The volume of 6 M HCl needed is, 10 mL
Explanation :
Formula used :
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1\text{ and }V_1[/tex] are the initial molarity and volume of diluted HCl.
[tex]M_2\text{ and }V_2[/tex] are the final molarity and volume of HCl.
We are given:
[tex]M_1=6M\\V_1=?\\M_2=0.4M\\V_2=150mL[/tex]
Now put all the given values in above equation, we get:
[tex]6M\times V_1=0.4M\times 150mL\\\\V_1=10mL[/tex]
Hence, the volume of 6 M HCl needed is, 10 mL