化学实验中为了收集到纯净的气体,宜用排液集气法,要求排出液具有挥发性小,对所集气体溶解得少(包括由化学反应引起的溶解)等特性。最常用的排出液是水。基于一些气体在水中溶解度较大,而在某些盐溶液中溶解度较小的事实,选用恰当的盐溶液作排出液收集相应的气体更适宜,例如可用排 In the chemical experiment, in order to collect the pure gas, it is preferable to use the liquid collection and gas collection method, which requires the discharge liquid to have the characteristics of small volatility, little dissolution of the collected gas (including dissolution caused by chemical reaction) and the like. The most common effluent is water. Due to the fact that some gases have higher solubility in water and less solubility in some salt solutions, it is more appropriate to use the appropriate salt solution as the effluent to collect the corresponding gas, for example, available