This question was in Osequim 2018 (Chemistry Olympics of Sergipe) for 2nd graders in high school (about 15/16 years old) and it's not normal to students learn organic chemistry at this grade, however this question appeared at the test and me as well as everybody else, got 0 points from this question, as you can see in these pictures: https://prnt.sc/u799enhttps://prnt.sc/u79dly
Question 12: Sulphanilic acid, used in the manufacture of dyes, is prepared by the reaction of aniline with acid
sulfuric: (see picture)
The acid has a pKa value of 3.23. The sodium salt of the acid, Na (H2NC6H4SO3), is very soluble in water.
If you dissolve 1.25 g of the salt in 125 mL of solution, what is the pH of the solution?
I've been looking for help to solve this question since the day of the test (May 2018) and since then i still have no clue how to solve this