Question

Tartaric Citric Malic Lactic Acid of interest C&H$O7 CaH&Os САН.Об С-Н.Оз Molecular formula он о OH O O но. Molecular но. Hас он Он Он но ОН structure OH O OH Он Он pKal 3.13 pK2 4.74 PK«3 = 5.40 pKaI 3.40 pK2=5.20 pKa1 2.89 pKa2 4.40 pKai 3.86 pKa2 NA Relative acidity Based on the Rrinformation you determined, rank the four organic acids from most polar to least polar. How does this ranking correspond to the pK, values given for these acids? Post Activity Ques tions NO O=
Based on the Rf information you determined, rank the four organic acids from most polar to least polar. How does this ranking correspond to the pKa values given for these acids?

Answer 1

AS The number of -CooH groups increased means polarity also be increased.

If the polarity of the solvent increases , that solvent can attract and hold the molecules tightly that means the adsorption power is maximum and so that Rf value will be maximum .

Thus Rf value is directly proportional to the polarity .

Therefore the order of polarity is

Citric acid > Tataric acid > Malic acid > Lactic acid