It simply not accurate enough .
because when different people use the same method the result are not equal for different people. this will bring the big uncertainty of result
Sour-tasting substances will be acidic, or have a pH of <7
A buffer.
pH is not measured for plastics.
The pH of solutions (liquids) is measured.
Any disinfectant has his characteristic pH; this pH must be measured.
pH is measured only in solutions or liquids. Marble chips has not a pH.
it can its about ph 1,2 or 3
pH is applied to liquids. For solids a pH can be measured in water solutions.
pH is measured only in solutions or liquids. Marble chips has not a pH.
by it's PH. The lower the PH, the higher acidic it is.
When the pH is measured with a calibrated instrument it is a quantitative measurement.