What does my distilled water contain

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The discussion centers on the properties of distilled battery water, specifically its reaction with copper hydroxide, which produces a greenish solution. The liquid in question is identified as a mixture of distilled water and sulfuric acid (H2SO4) commonly found in lead-acid batteries. When copper hydroxide (Cu(OH)2) reacts with diluted sulfuric acid, it typically forms copper sulfate (CuSO4) and water, with copper sulfate appearing deep blue in solution. The green color observed suggests the presence of an impurity or contamination in the sulfuric acid, potentially forming a complex with copper ions, as seen with citric acid. The exact nature of the contaminant remains uncertain, but the reaction indicates that the battery water is not pure sulfuric acid.
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I had this distilled battery water, it fizzes when I throw it on rock and it turns copper hydroxide into a greenish solution. does it have hydrochloric acid?
 
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When you say battery water, are you talking about the liquid that is inside of a lead-acid battery? That is a mixture of distilled water and battery acid (sulfuric acid, H2SO4)

Copper Hydroxide [ Cu(OH)2 ] reacts with diluted Sulfuric Acid [ H2SO4 ] to form water and Copper Sulfate [ CuSO4 ].

Edit: Though, why it's green I couldn't tell you...I'm not super good with chemistry, but this reaction is pretty much the way to create Blue Vitriol.
 
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Battery "water" is sulfuric acid (H2SO4).
It turns green when it reacts copper hydroxide because copper (II) ions are blue in solution.
From the reaction that should occur:
Cu(OH)2 (s) + H2SO4 (aq) = CuSO4 (aq) + H2O (l)
Copper (II) sulfate should be produced. In solution, this is a deep blue color. The fact that it is green as opposed to blue means that there is something else in your H2SO4 that the copper is forming a complex with. For instance, in citric acid, copper (II) ions form a light green complex. So, you've got H2SO4 with some sort of contamination. I'm not sure what it could be.
 
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