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H2S Partial Pressure Equation:
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H2S partial pressure (PP_H2S) is the pressure that hydrogen sulfide gas would exert if it alone occupied the same volume as the mixture at the same temperature. It's calculated from the H2S concentration in solution and Henry's law constant.
The calculator uses the following equation:
Where:
Explanation: The equation is derived from Henry's Law which states that the amount of dissolved gas is proportional to its partial pressure in the gas phase.
Details: H2S partial pressure is important in environmental monitoring, oil and gas industry, wastewater treatment, and safety assessments as H2S is toxic even at low concentrations.
Tips: Enter H2S concentration in mol/L and Henry's constant in atm·L/mol. Both values must be positive numbers. Typical Henry's constant for H2S at 25°C is about 0.1 atm·L/mol.
Q1: What is Henry's Law?
A: Henry's Law states that at constant temperature, the amount of gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid.
Q2: How does temperature affect H2S partial pressure?
A: As temperature increases, Henry's constant increases, meaning less gas dissolves at the same partial pressure.
Q3: What are typical H2S concentrations in different environments?
A: Concentrations vary widely from <0.0001 mol/L in clean water to >0.1 mol/L in some industrial or geothermal waters.
Q4: Why is H2S partial pressure important in industry?
A: It helps assess corrosion risks, toxicity hazards, and process efficiency in oil refining, biogas production, and other industrial processes.
Q5: How accurate is this calculation?
A: The calculation assumes ideal behavior and constant temperature. For precise work, temperature-specific Henry's constants should be used.