The metal ion and the anion of the mineral acid form an insoluble salt.

金属离子和无机酸的阴离子生成一种难溶的盐。

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Description: White powder, insoluble in water, soluble in mineral acids.

说明：白色粉末，不溶于水，可溶于无机酸。

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DESCRIPTION: Dark brown powder, insoluble in water and soluble in mineral acids.

形状颜色特征：黑褐色粉末，不溶于水，易溶于无机酸。

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