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To determine the number of moles of ions present in a known volume of solution, follow this example:

HCl dissociates completely in water into H+ and Cl-, because this is a strong acid, and only strong acids, bases, and ionic compounds have the ability to dissociate completely.

This means one equivalent of HCl will generate one equivalent of H+ and Cl- ions; the same number of moles of HCl will generate the same number of moles for H+ and Cl-

HCl --> H+ + Cl-

Now determine the number of moles in the volume of your solution. Remember that 1M is another way to say 1 mole/L.

(2moles HCl/ 1L) x (1L) = 2 moles HCl

Since the equation states that 1 equivalent of HCl is 1 H+, the final answer is:

(2moles HCl/ 1L) x (1L) x (1 mole H+/1mole HCl) = 2 moles H+

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