Question

What is the concentration of a 25.0 mL HCl solution containing a phenolphthalein indicator that is titrated with 0.1 M NaOH if it requires 34.2 mL before the solution turns pink?

A. 0.0578 M
B. 0.137 M
C. 1.37 M
D. 0.274 M

Answer 1

@sweetburger Is it B or C?

Answer 2

use the volume and concentration of the sodium hydroxide to find the moles used. Then use the balanced reaction to find the moles of acid that were also used. Then divide by the volume of acid (in L)

Answer 3

Okay, thank you!