氢氧化（《钠》）...
氢氧化
（《钠》）
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展开全部如果是浓强氧化钠，由于氢氧化钠易与二氧化碳反应生成碳酸钠，，而碳酸钠氢氧化钠中的溶解度相当低，会形成沉淀析出，这个方法也可以用来去除氢氧化钠中少量的碳酸钠。另一种情况就是，氢氧化钠中有少量杂质金属离子，刚开始形成的沉淀是胶体，不易发现，经过一夜的静置，胶体凝聚形成沉淀。
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生成caco3沉淀
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氢氧化钠溶液可以通过加热蒸发结晶吗？类比来说，其他像这样随温度增高溶解度变大的溶液，可以这样结晶吗？...
氢氧化钠溶液可以通过加热蒸发结晶吗？类比来说，其他像这样随温度增高溶解度变大的溶液，可以这样结晶吗？
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展开全部氢氧化钠溶液可以通过加热蒸发结晶但是加热需要根据空气吗，防止与二氧化碳的反应其他像这样随温度增高溶解度变大的溶液，可以这样结晶前提条件是蒸发的温度不可以使其分解，另外易与与空气中成分反应的，需要隔绝空气，或在惰性气体保护下进行
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溶解度的增加的影响不可能大于溶剂减小的影响， 是可以结晶的。
展开全部可以。用蒸发皿，当出现大量结晶时熄灭酒精灯，用余热蒸干。受热易分解或易蒸发的物质不能通过加热蒸发结晶。展开全部理论上可以。不过这样太浪费时间了，一般采用的是在高温下溶解，然后热过滤除去杂质后在低温下结晶，再抽滤展开全部如果不考虑NaOH在空气中变质的话可以。其他溶质要看情况而定，比如硫酸就不能用这种方法。
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氢氧化钠、氯化钠都是不带结晶水的常见的水合晶体有Na2CO3·10H2O（十水碳酸钠） CuSO4·5H2O（五水硫酸铜）FeSO4·7H2O（绿矾）这三个最常见
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r.clientWidth,bottom:n.clientHeight
r.clientHeight,height:n.clientHeight
r.clientHeight}}return this._expandRectByRootMargin(e)},n.prototype._expandRectByRootMargin=function(t){var e=this._rootMarginValues.map((function(e,n){return"px"==e.unit?e.value:e.value*(n%2?t.width:t.height)/100})),n={top:t.top-e[0],right:t.right+e[1],bottom:t.bottom+e[2],left:t.left-e[3]};return n.width=n.right-n.left,n.height=n.bottom-n.top,n},n.prototype._hasCrossedThreshold=function(t,e){var n=t&&t.isIntersecting?t.intersectionRatio
0:-1,r=e.isIntersecting?e.intersectionRatio
0:-1;if(n!==r)for(var i=0;i0&&function(t,e,n,r){var i=document.getElementsByClassName(t);if(i.length>0)for(var o=0;o展开全部氢氧化钠只是容易吸潮 不含结晶水展开全部氢氧化钠结晶有1,2,3,4,5,7 六种结晶水
展开全部应该没有吧…
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}