Nonelektrolit

Nonelektrolit, commonly called a non-electrolyte, is a substance that dissolves in a solvent such as water without dissociating into ions. As a result, solutions of nonelektrolit have few or no mobile charge carriers, and their electrical conductivity is very low. This distinguishes nonelektrolit solutions from electrolytes, which ionize in solution to produce ions that conduct electric current. Typical nonelektrolit include covalently bonded organic compounds such as glucose, fructose, urea, ethanol, acetone, and glycerol. Some inorganic substances can also act as nonelektrolit depending on the solvent.

In solution, the solute molecules remain intact; the van't Hoff factor i is approximately 1 for nonelektrolit, reflecting essentially one dissolved particle per formula unit. Consequently, nonelektrolit solutions exhibit colligative properties proportional to the solute particle number, though less dramatic than for electrolytes due to the lack of ions. Real solutions may show deviations due to hydrogen bonding, association, or incomplete dissolution. Weak acids or bases are not nonelektrolit; they are weak electrolytes that partially ionize.

The classification is solvent-dependent; a substance may be a nonelektrolit in one solvent and an electrolyte in another. In biology and medicine, many small organic molecules function as nonelektrolit in water and contribute to osmotic balance and transport properties without providing significant ionic conductivity.