KCl+HNO3

It seems like you are referring to the combination of potassium chloride (KCl) and nitric acid (HNO3), which is a chemical reaction. However, under normal conditions, when these two chemicals are mixed together, there is no significant reaction because both are strong electrolytes and when they dissolve in water, they dissociate into their respective ions:

KCl → K^+ + Cl^- HNO3 → H^+ + NO3^-

Since HNO3 is a strong acid and KCl is a neutral salt, there is no acid-base reaction to occur because Cl^- is the conjugate base of a strong acid (HCl), which does not react with the strong acid HNO3.

However, if you were looking for a different kind of reaction or a specific context like a lab preparation or a particular type of chemical analysis involving KCl and HNO3, please provide additional details, so I may assist you further.