(a) (10 marks) HEPES is known to form zwitterionic ions at neutral pH. Write down the zwitterionic form of HEPES and provide two chemical reasons to justify your answer.

(a) (5 marks). From elemental analysis, it is found that MSG contains the following mass distribution: carbon (35.00%), hydrogen (4.69%), nitrogen (8.16%), oxygen (38.57%), sodium (13.52%). Find the empirical formula of MSG [Molar mass information (g/mol): carbon 12.01, hydrogen 1.01, nitrogen 14.01, oxygen 16.00, sodium 23.00]