Answer:
IM HCl stands for "hydrochloric acid (HCl) solution with a concentration of 1 Molar (M)."
In scientific and chemical contexts, concentrations of solutions are often expressed using the unit "Molar" or "M." A 1 Molar solution (1M) means that there is one mole of the solute (in this case, HCl) dissolved in one liter of the solution.
Therefore, IM HCl refers to a hydrochloric acid solution where the concentration of HCl is 1 Molar. This concentration is commonly used in laboratory settings for various chemical reactions and experiments.