A way to measure pH using electrodes

A way to measure pH using a mixture of indicators

A way to measure unknown concentrations of a substance.

The point where an indicator starts to change color

sum of the number of protons and neutrons

number of protons in the nucleus

shows the radioactive decomposition of an element

atoms with identical atomic numbers but different mass numbers

You should pour water into acid.

A change of 1 pH unit represents a one hundred fold change in the acidity of the solution.

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