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The buffering capacity of water. This means its capacity to neutralize an acid solution by its content of bicarbonates, carbonates, or hydroxides, adding carbon to the water and preventing the pH of the water from becoming too basic or too acidic, stabilizing it at a pH of around 7.0. The lower the alkalinity, the less capacity the water has to absorb acids without becoming more acidic. The alkalinity can be raised by adding a buffer.

Subjects: Environmental Science.

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