In this paper, a new acid system that is called multi-hydrogen acid for sandstone acidizing is presented, which has been successfully applied on site.

本文提出了一种新型的砂岩储层酸化处理液¬¬—多氢酸酸液体系，并且已成功的运用于现场施工。

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That's what's left when formic acid loses a hydrogen ion.

甲酸失去氢离子便形成甲酸盐。

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The acetogenic bacteria directly convert all of the carbon in sugar into acetic acid, which is then combined with hydrogen to produce ethanol without the carbon losses, the firm claims.

ZeanChem声称，乙酸细菌直接将所有糖中的碳转化成乙酸，然后与氢结合生成乙醇而没有碳的损失。

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So by building up the concentration of ammonium ions inside its retaining membrane, H. pylori is able to fend off the destructive attentions of the hydrogen ions in stomach acid and thus live free from competition by less hardy germs.

ECONOMIST: Stomach turning | The

Car batteries are filled with acid and can give off hazardous hydrogen gas if mishandled.

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These ions, like the hydrogen ions that are the heart of every acid, have a single positive charge.

ECONOMIST: Stomach turning