Final answer:
The molar concentration of Na ions in a 0.0150 M solution of NaCl is also 0.0150 M, as each NaCl molecule dissociates into one Na+ ion. For salts that provide more than one Na+ ion per molecule, the molar concentration of Na+ would be proportionally higher.
Step-by-step explanation:
The molar concentration of Na ions in a solution depends on the dissociation properties of the sodium salt. For example, sodium chloride (NaCl) dissociates into one Na+ ion and one Cl- ion. Thus, in a 0.0150 M solution of NaCl, the molar concentration of Na+ ions would also be 0.0150 M because each molecule of NaCl contributes one Na+ ion.
The process to find the molar concentration typically involves two steps:
- Convert from grams to moles of the sodium salt using the molar mass of the substance and the volume of the solution.
- Determine the number of moles of ions present in the solution, which, for NaCl, would simply be the same as the number of moles of NaCl, since it provides one Na+ ion per molecule.
If the sodium salt were something like sodium sulfate (Na2SO4), which provides two Na+ ions per molecule, you would then have to double the number of moles of Na+ ions to get the molar concentration.