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a method of determining the concentration of an acid or base by neutralising it with a base or acid of known concentration.
convert nitrites into nitrates or ammonium ions into nitrites.
the part of the atmosphere that extends to a height of 10 km above the surface of the Earth.
a temporary unstable high energy composition of atoms representing a transition step between the...
a vertical column of elements in the periodic table which have similar properties.
ionisation chamber in which single ionising events can be detected.