煮沸消毒时,为提高沸点,水中加入碳酸氢钠的浓度为( )。A.0.1% B.0.5% C.1% D.3% E.5%

作者: rantiku 人气: - 评论: 0
问题 煮沸消毒时,为提高沸点,水中加入碳酸氢钠的浓度为( )。
选项 A.0.1% B.0.5% C.1% D.3% E.5%
答案 C
解析 水中放入碳酸氢钠(浓度1%~2%)可使沸点达到105℃ ,提高消毒灭菌效果,同时还有去污防锈的作用。

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