As carbon dioxide enters the blood it combines with water to form carbonic acid which then releases hydrogen atoms. This reaction decreases the pH of the blood, meaning it is more acidic.
Carbon dioxide is an acidic gas. This means that when in contact with water, it dissociates into electrolytes or ions. In the case of carbon dioxide, when coming into contact with water it first forms carbonic acid. This acid then quickly dissociates, releasing hydrogen ions.
By definition, the pH of a solution is more acidic when containing a higher number of H+ ions. Therefore, the release of these ions by the carbonic acid serves to lower the pH of the blood, making it more acidic.
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