Molar Concentration
There are three types of molar concentration:
Type A: It is calculated by dividing the number of moles of solute by the volume of the solvent in cubic decimeters (dm^3). The translation for this term is unclear in English and Japanese.
Type B: It is calculated by dividing the number of moles of solute by the volume of the entire solution in cubic decimeters (dm^3). In English, this is called molarity, and in Japanese, it is called モル濃度.
Type C: It is calculated by dividing the number of moles of solute by the mass of the solvent in kilograms (kg). In English, this is called molality, and in Japanese, it is called 質量モル濃度.
Mr. Downie suggests using Type A molar concentration for all cases. Ms. IIjima/Kamimura recommends using Type B molar concentration in the prep room. Ms. Zala suggests using Type A for solid solute and Type B for liquid solute. Cambridge/Kognity recommends using Type B molar concentration.
- In the end, which type should be used for the experiment depends on the rate of reaction.
- Molality is not the same as molarity, and the naming of these concepts is confusing.
- Moreover, these concepts are very similar.