如何用95%乙醇配制75%的乙醇 100mL 求详细解答乙醇多少 水多少 拜托啦 用95%的乙醇配制75%的乙醇100ML，应取95%的乙醇多...
\u5982\u4f55\u752895%\u4e59\u9187\u914d\u523675%\u7684\u4e59\u9187 100mL \u6c42\u8be6\u7ec6\u89e3\u7b54\u4e59\u9187\u591a\u5c11 \u6c34\u591a\u5c11 \u62dc\u6258\u5566\u8fd9\u91cc\u7684\u767e\u5206\u6bd4\u662f\u6307\u4f53\u79ef\u6bd4\uff0c\u4e24\u79cd\u6eb6\u6db2\u6df7\u5408\u540e\u4f53\u79ef\u53d8\u5316\u5ffd\u7565\u4e0d\u8ba1.
95\uff05\u7684\u4e59\u9187100\u00d775\uff05/95\uff05=78.9ml\uff0c\u6c34=100-78.9=21.1ml
100*75%/95%=78.95ml
这里的百分比是指体积比，两种溶液混合后体积变化忽略不计.95％的乙醇100×75％/95％=78.9ml，水=100-78.9=21.1ml
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