Question

(Please help!) One way to describe the concentration of an acid is as a percent by volume. For example, in 40 mL of a 30% acid solution, the volume of pure acid is 40 x 30/100 or 12 mL, and the volume of water is 40-12 or 28 mL. If 5 mL of pure acid is mixed with 20 mL of water to give 25 mL of acid solution, the concentration of the solution is given by 5/25 x 100% = 20 %. If water is mixed with 50 mL of 40% acid solution, write an equation that describe the acid concentration, C(x), as a function of the volume of water added, x.

Answer 1

Function is: C(x) = 20/(50 + x)*100%

And so, what is the acid concentration after 10 mL of water have been added?

Answer 2

Just replace x with 10.

Answer 3

that's it?

Answer 4

is 33 1/3% the same as 33.333% ?

Answer 5

\[c(10)=\frac{20}{60}=.333(100)=33.3 percent\]

Answer 6

yes

Answer 7

ohh, okay thank you!

Answer 8

yw