请问一公斤的95%酒精要加多少去离子水才能配成75%酒精？ 2500毫升的90度酒精如何配成75度酒精？

95%\u7684\u9152\u7cbe\uff08\u662f\u4f53\u79ef\u5206\u6570\uff09\u6309\u91cd\u91cf\u600e\u4e48\u914d\u621075%\u7684\u9152\u7cbe\uff08\u4e5f\u662f\u4f53\u79ef\u5206\u6570\uff09

\u8fd9\u4e2a\u6211\u597d\u50cf\u914d\u8fc7\uff0c\u4f53\u79ef\u5206\u6570\u7684\u610f\u601d\u5c31\u662f\uff0c\u5982\u679c95%\u7684\u9152\u7cbe\uff0c\u76f8\u5f53\u4e8e100ml\u6c34\uff0c95ml\u9152\u7cbe\uff0c\u6309\u91cd\u91cf\u914d\u621075%\u7684\u9152\u7cbe\uff0c\u6298\u5408\u8ba1\u7b97\u4e00\u4e0b\u5e94\u8be5\u662f\u53d6\u5927\u7ea678.95ml\u768495%\u7684\u9152\u7cbe\u4e0e\u6c34\u6df7\u5408\u81f3100ml\uff0c\u5982\u679c\u6d4b\u91cd\u91d1\u5c5e\u7528\u53bb\u79bb\u5b50\u6c34\uff0c\u5176\u4ed6\u7528\u84b8\u998f\u6c34\u6df7\u5408\u3002\u4f60\u8fd9\u4e2a\u5b9e\u9a8c\u9152\u7cbe\u914d\u7684\u4e0d\u8981\u5f88\u7cbe\u786e\u5427\uff1f95%\u7684\u9152\u7cbe\u53ef\u80fd\u6709\u70b9\u6325\u53d1\uff0c\u5982\u679c\u8981\u6c42\u4e0d\u662f\u5f88\u7cbe\u786e\uff0c\u4f60\u53ef\u4ee5\u752879\u6216\u800580ml\u768495%\u7684\u9152\u7cbe\u914d\u7f6e100ml\u768475%\u7684\u9152\u7cbe\u3002

\u9152\u7cbe\u7684\u5ea6\u6570\u662f\u6307\u4f53\u79ef\u5206\u6570\uff0c95\u5ea6\u7684\u914d\u621075\u5ea6\u7684\uff0c\u53d62500mL95\u9152\u7cbe\uff0c95/0.75=126.67\uff0c\u9700\u8981\u52a025x26.67mL=666.75ml\u7684\u6c34\uff0c\u5c31\u914d\u6210\u4e8675\u5ea6\u9152\u7cbe\u3002

答：设加入的蒸馏水的质量为 m ,
计算：[(0.95x1)/(1+ m)] = 0.75
m = (0.95-0.75)/ 0.75 = 0.267 (公斤)

设：需要加水x 升【1L水=1公斤水】
（1+x）X75%=1LX95%
X=0.2666L=0.2666公斤

1*95% /75% -1

=1.27 -1
=0.27kg

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绛旓細绋閲婂嵆鍙備緥濡傚彇100mL95閰掔簿锛95/0.75=126.67锛闇瑕佸姞26.67mL鐨勬按锛屽氨閰嶆垚浜75搴﹂厭绮俱傞厭绮剧█閲,灏辨槸鎶婇珮娴撳害鐨勶紙95%锛夐厭绮撅紙鏈500姣崌鍖呰鐨勩95%閰掔簿锛,鍔犱竴瀹氫綋绉按鍚,閰嶅埗鎴愪綆娴撳害鐨勶紙渚嬪75%锛夐厭绮剧殑杩囩▼銆備緥濡傞厤鍒100姣崌 75%閰掔簿 锛氳绠楀紡 姹傚彇95%閰掔簿鐨勪綋绉 V =( 75%x100ml)/...

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