Answer:
Major species in the solution present in higher concentrations about more than 10% of the other species in the solution. The nature of solute that is dissolved in the solution, or the extent of reaction of different groups with the solvent decide the major species present in the solution.
Explanation:
For weak acids(bases) dissolved in water, the major species will be the undissociated acid(base) and water as the extent of dissociation of the molecular weak acid(weak base) is relatively less. For ionic solutes, the major species after dissolution in water will be the ions that form in the solution in addition to water.
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