Multi-hydrogen acid is a kind of compound and it is so called because it has five hydrogen ions.

多氢酸是一种复合物，因含有多个氢离子，而称之为多氢酸。

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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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When hydrogen sulfide reacts with the oxygen in the water, the result of that is sulfuric acid.

当硫化氢与水中的氧反应，得到的就是硫酸。

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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