NaOH is a strong base that dissociates completely in water. Since it is a strong base, we can assume that all the hydroxide ions (OH-) will react with water to form water molecules and hydronium ions (H3O+).
The balanced equation for this reaction is:
OH- + H2O → H2O + H3O+
Since NaOH is a strong base, its concentration of hydroxide ions is equal to its concentration in moles per liter (Molarity), which is 0.0010 M.
In the reaction, the ratio between hydroxide ions (OH-) and hydronium ions (H3O+) is 1:1. Therefore, the concentration of hydronium ions is also 0.0010 M.
So, in the 0.0010 M solution of NaOH, the concentration of H3O+ (hydronium ions) is also 0.0010 M.