1、determination of acidity or alkalinity of the aqueous extract
5、Extreme acidity or alkalinity hastens how quickly enzymes degrade biological molecules—although again, the presence of ample water can mediate the effects.
4、Indicator A substance used to test for acidity or alkalinity of a solution by a color change.
6、"pH Quantitative measure of the strength of the acidity or alkalinity (see acid, Base) of a solution. It is defined as the negative common logarithm of the concentration of hydrogen ions [H+] in moles/litre: pH = -log10 [H+]."
3、Determination of acidity or alkalinity of the aqueous extract of pigments
2、Buffer a solution that resists any change in acidity or alkalinity.