Citric acid structure Lemon juice contains citric acid with a concentration of approximately 0.30 M (around 6% by mass), giving rise to its acid properties. Citric acid is generally considered a triprotic acid (capable of donating 3 protons). Q4. Sketch a Lewis structure of citric acid in the form it would have after reaction with a base in solution. Show all atoms including hydrogens, all lone pairs and any formal charges. | Fantasy