Hno3 increases the concentration of when added to water

Since HNO3 is a strong acid, it would dissociate completely forming ions of H+ and NO3-. The ionization or dissociation of HNO3 will increase the concentration and or amount of H+ within the water, resulting in the pH or measure of H+ to decrease, indicating that the solution is tending to become acidic.

Although the diagram is not shown, i know that the convection is heated by a the core.