Multiple Choice
Determine the Henry's law constant for ammonia in water at 25°C if an ammonia pressure of 0.022 atm produces a solution with a concentration of 0.77 M. What is the Henry's law constant (k_H) in M/atm?
14. Solutions
Henry's Law Calculations
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The Henry's law constant for helium gas in water at 30°C is 0.000370 M/atm. When the partial pressure of helium above a sample is 0.400 atm, what is the concentration of helium in the water?
A
0.00370 M
B
0.00148 M
C
0.000370 M
D
0.000148 M
Verified step by step guidance1
Identify the given values: Henry's law constant (k_H) is 0.000370 M/atm and the partial pressure of helium (P_He) is 0.400 atm.
Recall Henry's Law, which states that the concentration of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. The formula is: C = k_H * P, where C is the concentration of the gas.
Substitute the given values into the Henry's Law equation: C = 0.000370 M/atm * 0.400 atm.
Perform the multiplication to find the concentration of helium in the water. Ensure that the units of atm cancel out, leaving the concentration in M (molarity).
Verify the units and the calculation to ensure the concentration is expressed in molarity (M), which is the standard unit for concentration in chemistry.
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