The Doctor notices that the water in a dam near the fissure has become warm and acidic, suggesting that it has been heated.

In some past mine disasters, processing chemicals have leaked into waterways; waste rock has become acidic and leached heavy metals.

By 1800 the water of Loch Enoch had already become acidic.

Bicarbonate is a chemical (buffer) that keeps the pH of blood from becoming too acidic or too basic.

Because the levels of atmospheric carbon dioxide are increasing, the oceans are becoming more acidic.

What other effects may this have, such as the ocean becoming more acidic 1?

The uptake of anthropogenic carbon since 1750 has led to the ocean becoming more acidic with an average decrease in pH of 0.1 units.

Both H's become acidic.

Scientists and divers say the water in the reservoir is becoming more acidic, increasing the risk of corrosion to equipment, a notion Mr. Coimbra dismissed.

The ocean is becoming more acidic.