In a hospital laboratory, a 55 mL sample of gastric juice (which contains the strong acid HCl) obtained several hours after a meal was titrated with 0.090 M NaOH to neutrality; 14.2 mL were required. What is the pH of the gastric juice

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.