February 28, 2020, 09:14:10 PM
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Topic: How much Lt Oxygen in water  (Read 635 times)

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Offline MNIO

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Re: How much Lt Oxygen in water
« Reply #15 on: February 13, 2020, 03:51:57 PM »
note sure if you have this solved yet, but how about I through in a couple of hints

this is henry's law.
  Pa = k * Ca
where
  Pa = partial pressure of component "a" over a liquid
  k = a constant (provided the temp is constant)
  Ca = concentration of component "a" in the liquid phase

you have t conditions of Pa and Ca... so what if we do this?
  Pa1 = k * Ca1
  Pa2 = k * Ca2
divide
  Pa1 / Pa2 = (k / k) * (Ca1 / Ca2)
simplify and rearrange
  Ca2 = Ca1 * (Pa2 / Pa1)

now.. that's all in partial pressures.  We don't have partial pressures, we have total pressures.  But let's make the assumption that
  Pa2 / Pa1 = Ptotal 2 / Ptotal 1
which will be close in this case
so that
  Ca2 = Ca1 * (Pa2 / Pa1)

you get to finish

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