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氨水

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氨水

氨水

  氨水又稱阿摩尼亞水,主要成分為NH3·H2O,是氨氣的水溶液,無色透明且具有刺激性氣味。熔點-77℃,沸點36℃,密度0.91g/cm^3.易溶于水、乙醇。易揮發,具有部分堿的通性,由氨氣通入水中制得。有毒,對眼、鼻、皮膚有刺激性和腐蝕性,能使人窒息,空氣中較高容許濃度30mg/m^3.主要用作化肥。
  工業氨水是含氨25%~28%的水溶液,氨水中僅有一小部分氨分子與水反應形成銨離子和氫氧根離子,即氫氧化銨,是僅存在于氨水中的弱堿。氨水凝固點與氨水濃度有關,常用的(wt)20%濃度凝固點約為-35℃。與酸中和反應產生熱。有燃燒爆炸危險。比熱容為4.3×10^3J/kg·℃﹙10%的氨水)
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