The concentration of H2SO4 in a bottle labelled "concentrated sulphuric acid" is 18M what does it mean
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It means that there are 18 mols ,each mole containing about 6*10^23 molecules (Avagadro's number), of H2SO4 in every liter. The H2SO4 is mainly in ionic form as H+ and SO4-2 ions.
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