Question

A buret is filled with 0.1517 m naoh (aq). 25.0 ml of an unknown acid ha (aq) and two drops of indicator are added to an erlenmeyer flask, and the titration experiment is carried out. if the initial buret reading was 0.55 ml, and the buret reading at the endpoint was 22.50 ml, what is the molarity of the unknown acid, ha?

Answer 1

The concentration of the acid HA is 0.1727 M.

Step-by-step explanation:

The formula for the relationship between concentration and volume is:

`c_(1) v_(1) = c_(2) v_(2)` where 1 and 2 are the values for acid and base respectively.

Given:

c1 = ?

v1 = final vol - initial vol = 22.50 - 0.55 mL = 21.95 mL

c2 = 0.1517 M

v2 = 25.o mL

∴ c1 =
`(0.1517 * 25)/(21.95)`

concn = 0.1727 M