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2021 Why does pH of water reduces with increases in temperature

Problem statement: “I’m trying to calculate the right quantity of OH dosing to keep the pH in a High-pressure steam drum at 10. The water comes from the deaerator and increases 120 °C, until 280 °C, 77 bar. I know that pH goes down when the temperature goes up. I would calculate, knowing the water flow and the inlet pH, the right Mass of OH to pump. I can’t find the formula with pH and temperature.

 

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