Answer:
The amount of solute added is directly proportional to the number of ions. The higher the amount added the higher the number of moles. The number of moles is multiplied by the Avogadro's constant to get the number ions.
The indicator of the number of ions in solution is "the amount of solute added".
When introduced to acidic and alkaline solutions, substances are generally considered indicators when their color changes. There are several indicators that were already frequently used in laboratories, including litmus, phenolphthalein, as well as methyl orange.
A solute includes something that has been dissolved in a solvent, which involves another substance.
Therefore, the indicator of the number of ions in solution is "the amount of solute added".
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