A 508mL NaCl solution is diluted to a volume of 1.05L and a concentration of 5.00mol L−1 . What was the initial concentration?
Express the molar concentration numerically.

Question

A 508mL NaCl solution is diluted to a volume of 1.05L and a concentration of 5.00mol L−1 . What was the initial concentration?
Express the molar concentration numerically.

abb0t · Answer

Use M$_1$V$_1$=M$_2$V$_2$ and then rearrange to solve for $\sf \color{red}{M_1}$, which is your initial concentration.

abb0t · Answer

Also, don't forget to convert mL $\rightarrow$ L

abb0t · Answer

You want to keep the units consistent throughout your calculation(s).

anonymous · Answer

I did that but for some reason it's coming up wrong. :(

I got 14.8 as my answer.

abb0t · Answer

I think it's because you're not converting units. Notice were given both mL and L. and concentration is in mols per liter.

anonymous · Answer

oh thank you so much!