求翻译：白色结晶粉末或颗粒，吸湿性强，溶于水并分解释放出氢气，在酸性条件下分解相对较快，在碱性条件下相对稳定。是什么意思？

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white crystalline powder or granules, hygroscopic, and soluble in water and is explained in an acid, hydrogen release conditions, they break down relatively quickly, and in alkaline conditions relatively stable.

The white crystallization powder or the pellet, water absorbant, dissolves in the water and decomposes releases the hydrogen, decomposes relatively under the acidic condition quick, is relatively stable under the alkalinity condition.

White crystalline powder or granules, strong Hygroscopicity, soluble in water and decompose releasing hydrogen, decompose relatively quickly in acidic conditions, relatively stable under alkaline conditions.

Appearance: colourless crystals or white powder. Hygroscopicity. Density of 2.33. At 180 ° c losing two molecular crystal water, 300 c lose all their water of crystallization. Nature and sodium pyrophosphate similar, but larger solubility. Soluble in water, insoluble in ethanol