is spinach acid forming
Relative Acidity of Spinach. 1  Even though the oxalic acid in spinach behaves as a strong acid, since the pka(s) of oxalic acid are 1.38 and 4.28, the overall pH of (cooked) spinach is fairly close to neutral meaning that it is highly unlikely to erode your enamel.he oxalic acid content in spinach is relatively high (~6,580 ppm), which causes many people to be concerned. However, the overall pH of Spinach is not very acidic (cooked = 6.6) and spinach also has high calcium and iron content.