Answer:
Molar
Step-by-step explanation:
Molar is a term for concentration of a substance. It is defined as moles/liter. 1.85M would mean the concentration of a solute is 1.85 moles of that substance (solute) per 1 liter of solution (solvent). 1.85M NaOH tells us that the liquid in the beaker in front of you has 1.85 moles of NaOH per 1 liter of solvent (typically water). There may be differing amounts of solution, but in all cases the concentration of NaOH will be the same. To make a 1.0 M solution of aqueous NaOH, take 1 molar mass of NaOH (1 mole), which is 40 grams of solid NaOH, and add enough water to make it 1 liter. That is a soultion with 1 mole per liter. For 500ml, take 1/2 the NaOH, or 20g, and add water to the 500ml (0.5L) mark.