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[求助] 求教：一篇制备杂多酸的文献里有些地方不太理解

The orange solid that remained was dissolved in 50 ml of water, concentrated to the first appearance of crystals in a vacuum desiccator over concentrated sulfuric acid, and then allowed to crystallize further. The orange crystals that formed were filtered, washed with water, and air dried. The yield was 28 g. The crystalline acid effloresces slowly at room temperature; thus the amount of water of crystallization varied slightly from sample to sample. Anal. Calcd for H4[PMo11VO40]32.5H20: P, 1.31; Mo,44.60; V, 2.15; H20,24.71. Found: P, 1.31; Mo, 44.54; V, 2.68; H2O (based on Mo), 24.86. The molar ratios are Mo to P, 10.97 to 1.00; and V to P, 1.24 to 1.00. Similar analyses were All other reagents used were Baker Analyzed grade.
杂多酸在真空干燥器中结晶时为什么要“over concentrated sulfuric acid”？为什么这里要用到浓硫酸呢？
还有下面算原子个数比的时候Mo：P不应该是44.6:1.31么？怎么得出来的是10.97 to 1.00？
本人刚接触杂多酸，还望不吝赐教！