Question

what volume of water must be added to 20 mL of a 4 M NaOH solution to yield a solution that is 0.4 M in NaOH?

Answer 1

\(\boxed{\boxed{\boxed{\color{red}{\huge\heartsuit\boxed{H}}\color{green}{\boxed{E}}\color{green}{\small\boxed{L}}\color{green}{\boxed{L}}\color{blue}{\huge\boxed{O}}\color{blue}{\huge\heartsuit}}}}\) @sunshao1

Answer 2

4 M NaOH solution means there will be 4 moles of NaOH in 1000 ml of NaOH, so in 20 ml there will be 0.08 moles

Answer 3

Now, let the volume of water be x then,
\[\frac{ 0.08 }{ 0.02 + X } = 0.4\]

Answer 4

So, 180 ml of water is needed

Answer 5

@alphadxg

Answer 6

algebra from there