10. Thymol blue is a pH indicator. It changes colors from red to yellow at pH 1.2-2.8 and from yellow to blue at pH 8.0-9.6. Add curved arrows to show the reaction from neutral (yellow) to basic (blue) conditions and the reverse reaction. O-H HO OH soco HO HO So, -So red yellow blue 11. Draw the conjugate base for each of the following. OH 12. Draw the conjugate acid for each of the following: H-O-H 13. Imidazoles, such as that found in the amino acid histidine, are capable of acting as acids and bases. Identify which portion of the imidazole ring shown below can act as an acid, and which can act as a base. Draw a curved arrow representation of how this imidazole would react if combined with acetic acid. Draw another representation to show the reaction of the imidazole with piperidine. N N . OH -N N 14. Draw the conjugate acid(s) and base(s) for glycine and phenylalanine. OH HNi NH glycine phenylalanine O -S=0 OH