How can i calculate PH value of solution that i know concentration of Nitrite,Nitrate and Nitrous acid?

26 February 2020 0 6K Report

the PH value of solution measured by PH meter is low between 2.1 to 3, it means the solution is acidic. I know I can use the Henderson-Hasselbalch Equation to calculate PH. but for this calculation i need to know concentration of HNO3 as well. in the solution there is two acids one of them is weak and the other one is strong. I know there are two competitive equilibria for weak and strong acid that for strong acid lies more to the left regarding low PH.

[HA]+[H2O][ H3O+]+[A-]

[A-]+[H2O][ OH-]+[HA]

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