Consider the titration of a strong acid with a strong base (i. e. the starting solution is acidic). Assuming that the acid-base indicator used will visibly change color when [In-]/[HIn] = 1/10, ideally what pKa should HIn have to indicate the true equivalence point of the titration

3

explanation:

answer: mercury

explanation:

imma come back to you hold on

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.