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Regardless of water or air, Apples along with other fruits generally turn brown when exposed to oxygen. This is an chemical reaction between the iron containing molecules and the air (oxygen). Cut/bruised Apple + oxygen will result in browning. You can delay this reaction by adding lemon juice, or other acidic solution (pH changes, reaction variables change).

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Why does apple go brown when put in water?

Because the apple has a chemical in it that will make it turn brown when wet.


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