同样的原理，如果将石膏更换为芒硝，可得到硫和碳酸钠溶液，进一步加工可得纯碱。

Similarly, if the gypsum is replaced by sodium sulfate, the sulphur and sodium carbonate solution can be obtained. And the soda can be produced by further processing.

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结果表明：先用磷酸酸洗，再用氢氧化钠、磷酸三钠、碳酸钠溶液碱洗的预处理方案得到的转化膜耐腐蚀性能最优。

The results show that corrosion resistance of the stannate conversion coating pretreated as following process: acid pickled by phosphate first, then alkaline pickled by s...

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例如碳酸钠和邻苯二酸氢钾，分别用来标定酸和碱溶液。

Examples are sodium carbonate and potassium acid phthalate which are used to standardize acid and base solutions.

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