Assertion: acid rain's acid | /r/HasSubevent | rainwater
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Source sentences:
text: While it is true that carbon dioxide concentrations control the pH of rainwater (this is basic aquatic chemistry) and that an increase in carbon dioxide will decrease the pH of rainwater, the acid that is formed as carbon dioxide equilibrates with rainwater is a weak acid–resulting in rainwater being naturally acidic and having a pH of about 5.5.