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Gauge pressure, membrane in closed container

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Two parts of a closed container are separated by a membrane which only allows the passage of water. Initially each container holds 5 liters of deionized water. To one side is added 22 grams of chlorine and to the other side is added 15 grams of potassium. Each side has a pressure gauge. Which side will record the highest pressure? Why? By how much?

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I think in deionized water the chlorine and potassium will not react.

Because, chlorine is gas and potassium is solid, hence, chlorine will have more pressure than ...

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With good explanations and calculations, the problem is solved.

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