espanolSe determino la viscosidad dinamica de las soluciones acuosas diluidas del liquido ionico cloruro de 1-butil- 3-metilimidazolio ([Bmim+][Cl-]) en el intervalo de temperaturas de 283.15 a 318.15 K a presion atmosferica 0.1 MPa, usando un Microviscosimetro Automatico Anton Paar (AMVn). Se evaluaron los coeficientes A, B y D de viscosidad, y se encontro que las fuerzas de largo alcance de naturaleza electrostatica entre las especies ionicas [Bmim+] y [Cl-] dominan el comportamiento viscosimetrico del sistema [Bmim+][Cl-] + agua, ≠≠ a todas las temperaturas. Tambien se analizaron los parametros de activacion del flujo viscoso ∆? , ∆? , ∆?≠ y se encontro que el proceso de flujo viscoso resulto endotermico y evidencio un predominio de las interacciones ion-ion. EnglishThe dynamic viscosity of dilute aqueous solutions of the ionic liquid 1-butyl-3-methyl imidazolium chloride ([Bmim+][Cl-]) in the temperature range of 283.15 to 318.15 K at atmospheric pressure 0.10 MPa was determined. For this an automatic Microviscosimeter Anton Paar (AMVn) was employed. The coefficients of viscosity A, B and D were evaluated, and it was found that long range forces of electrostatic nature between the ionic species [Bmim+] and [Cl–] dominate the viscosimetric behavior of the system [Bmim+] + [Cl ] + water, at all temperatures. The activation parameters of viscous flow ∆? , ∆? and ∆? were also analyzed and it was found that viscous flow process was endothermic and showed a predominance of the ion-ion interactions.