A 1 molal solution is a way of expressing the concentration of a solution. It is defined as a solution that contains 1 mole of solute dissolved in 1 kilogram of solvent.
To put this in simpler terms, if you have a solute (like salt or sugar) and you want to make a molal solution, you would take 1 mole of that solute and mix it with exactly 1 kilogram of the solvent (typically water). This concentration unit is particularly useful in chemistry because it does not change with temperature, making it a practical choice for experiments that require precise measurements.
For instance, if you were to dissolve 58.44 grams of sodium chloride (NaCl), which is one mole of NaCl, in 1 kilogram of water, you’d have created a 1 molal NaCl solution. The advantage of molality over molarity, which is based on volume, is that molality is based on mass and remains constant across temperature changes.