The molecular formula of citric acid is C 6 H 8 O 7. The chemical formula for citric acid is best shown by a diagram of its complete structural formula. This shows how the atoms are arranged in the molecule. Citric acid has three carboxyl or-COOH groups and is triprotic in nature.
In order to make tan you should mix white and brown. If you want to make the brown color yourself mix 2 parts of one primary color (like red) and 1 part of each of the other t â¦ wo (blue and yellow). The more white you use the lighter the shade of tan.
Or starting with Burnt Sienna (which is brown, but not dark) and adding something like ultramarine blue and cad red together to make a neutral mix on top of that. I'll also use a Burnt Sienna (or what I prefer is actually Transparent Red Oxide) and then a dark grey like Neutral Tint or Graphite Grey or a purple.