Why does pure water have no taste or colour?

Physical properties of a compound, such as colour, taste, touch etc. depend on its pH factor. The pH further depends upon the concentration of H+ and OH- ions in that compound. For example, compounds having higher concentration of H+ ions are sour, acids and compounds having higher OH- ion concentrations like bases are bitter. Water has equal concentration of H+ and OH- ions. Thus, it has neither sour nor a bitter taste, and hence is tasteless. Similarly, it is colourless and doesn't have an odour.
  

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