what is the difference between molarity and molarlity

Are you asking molarity and molality?

Molarity is #mols/L of solution.
Molality is #mols/kg of solution.

After reading this post several hours after posting, let me rephrase the molality. Molality is # mols/kg of solvent (not solution). Technically there is a difference and my first post is incorrect.

how much 0.150M NaOH could be need to just neutralize 15.00mL of 0.175M HCl

Molarity and molality are both units of concentration used in chemistry, but they are defined based on different parameters. The main difference between molarity and molality lies in the units used to express concentration.

Molarity (M) is defined as the number of moles of solute dissolved in one liter (L) of solution. It is expressed as moles of solute per liter of solution (mol/L). To calculate molarity, you need to know the number of moles of solute and the volume of the solution in liters.

On the other hand, molality (m) is defined as the number of moles of solute dissolved in one kilogram (kg) of solvent. It is expressed as moles of solute per kilogram of solvent (mol/kg). Molality is a more accurate measure of concentration because it takes into account the mass of the solvent, which does not change with temperature changes or other conditions. To calculate molality, you need to know the number of moles of solute and the mass of the solvent in kilograms.

In summary, the main difference between molarity and molality is the unit of concentration used: molarity is expressed as moles of solute per liter of solution (mol/L), while molality is expressed as moles of solute per kilogram of solvent (mol/kg). Molarity depends on the volume of the solution, while molality depends on the mass of the solvent.