求翻译：Manganese solids formed during the reaction were allowed to precipitate.Changes of pH values during the reaction were less than 0.2 pH units.是什么意思？

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悬赏分：1 - 离问题结束还有

Manganese solids formed during the reaction were allowed to precipitate.Changes of pH values during the reaction were less than 0.2 pH units.

问题补充：

匿名	2013-05-23 12:21:38 正在翻译，请等待...

匿名	2013-05-23 12:23:18 锰的反应过程中形成固体沉淀允许变更的ph值低于0.2的反应是酸硷值单位。

匿名	2013-05-23 12:24:58 正在翻译，请等待...

匿名	2013-05-23 12:26:38 在反应过程中形成的锰固体获准沉淀。在反应过程中 pH 值的变化都小于 0.2 ph 值单位。

匿名	2013-05-23 12:28:18 正在翻译，请等待...

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