很好的猜测,但是不对.
铷作为一种碱金属金属性极强.
氢氧化铷是非常强的碱,比同等浓度的火碱还要更危险.
那么,氢氧化铷完全电离,因此铷离子不水解.
金属性相对弱的金属,如铝离子才水解.因为其对应碱：Al(OH)3不是在水中完全电离,而且
直接是沉淀.
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