求助:将500毫升浓度为95%的酒精,稀释成浓度为75%的消毒酒精,需要加水多少毫升? 95%酒精500毫升配制成75%的酒精需要加多少毫升水
\u628a500ml 95%\u7684\u9152\u7cbe\u7a00\u91ca\u621075%\u7684\u9700\u8981\u52a0\u591a\u5c11\u6c34\u9700\u8981\u52a0133.33ml\u84b8\u998f\u6c34\u3002
\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a
500ml\u768495\uff05\u9152\u7cbe\u4e2d\u542b\u9152\u7cbe\uff1a500\u00d795\uff05\uff1d475\uff1b
75%\u9152\u7cbe\u4e2d\u82e5\u6709475\u514b\u9152\u7cbe\uff0c\u5176\u603b\u91cd\u91cf\u4e3a\uff1a475\u00f775\uff05\uff1d633.33ml\uff1b
\u6240\u4ee5\u9700\u8981\u589e\u52a0\u6c34\u7684\u603b\u91cf\u4e3a\uff1a633.33\uff0d500\uff1d133.33ml\u3002\uff08\u84b8\u998f\u6c34\uff09
\u6269\u5c55\u8d44\u6599
\u5de5\u4e1a\u9152\u7cbe\u548c\u533b\u7528\u9152\u7cbe\u7684\u533a\u522b
1\u3001\u7eaf\u5ea6
\u533b\u7528\u9152\u7cbe\u662f\u6307\u533b\u5b66\u4e0a\u4f7f\u7528\u7684\u9152\u7cbe\uff0c\u533b\u7528\u9152\u7cbe\u7684\u7eaf\u5ea6\u6709\u591a\u79cd\uff0c\u5e38\u89c1\u7684\u4e3a95%\u548c75%\u3002
\u5de5\u4e1a\u9152\u7cbe\u662f\u6307\u5de5\u4e1a\u4e0a\u4f7f\u7528\u7684\u9152\u7cbe\uff0c\u5de5\u4e1a\u9152\u7cbe\u7684\u7eaf\u5ea6\u4e00\u822c\u4e3a95%\u548c99%
2\u3001\u6bd2\u6027
\u533b\u836f\u9152\u7cbe\u7531\u4e8e\u6d53\u5ea6\u4f4e\uff0c\u53ef\u4ee5\u7528\u4e8e\u4eba\u4f53\u7684\u6d88\u6bd2\u3002
\u5de5\u4e1a\u9152\u7cbe\u4e0d\u80fd\u7528\u4e8e\u4eba\u4f53\u7684\u6d88\u6bd2\uff0c\u56e0\u4e3a\u7532\u9187\u4f1a\u5bfc\u81f4\u4e2d\u6bd2\uff0c\u7528\u4e8e\u76ae\u80a4\u6d88\u6bd2\u4e5f\u4f1a\u6709\u90e8\u5206\u88ab\u76ae\u80a4\u5438\u6536\uff0c\u4e2d\u6bd2\u540e\u4e25\u91cd\u7684\u53ef\u5bfc\u81f4\u5931\u660e\u751a\u81f3\u6b7b\u4ea1\u3002
3\u3001\u7528\u9014
\u533b\u836f\u9152\u7cbe\u4e3b\u8981\u7528\u4e8e\u6d88\u6bd2\u3001\u6740\u83cc\u3002
\u5de5\u4e1a\u9152\u7cbe\u53ef\u7528\u4e8e\u5370\u5237\u3001\u7535\u5b50\u3001\u4e94\u91d1\u3001\u9999\u6599\u3001\u5316\u5de5\u5408\u6210\u3001\u533b\u836f\u5408\u6210\u7b49\u65b9\u9762\u3002\u53ef\u7528\u4f5c\u6e05\u6d17\u5242\u3001\u6eb6\u5242\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1\u2014\u533b\u7528\u9152\u7cbe
133\u6beb\u5347\u3002
\u9152\u7cbe\u6eb6\u6db2\u662f\u9152\u7cbe\u6eb6\u4e8e\u6c34\uff0c\u56e0\u6b64\u5bc6\u5ea6\u603b\u5c0f\u4e8e1g/cm3\uff0c\u8bbe75%\u9152\u7cbe\u6eb6\u6db2\u4e3aX ml95%\u9152\u7cbe\u5bc6\u5ea6\u5c0f\uff08p\u5c0f g/cm3\uff09\uff0c75%\u9152\u7cbe\u5bc6\u5ea6\u5927\uff08p\u5927 g/cm3\uff09 \u767e\u5206\u6570\u5747\u4e3a\u8d28\u91cf\u5206\u6570\u3002
\u56e0\u6b64\u670995%*p\u5c0f*500=p\u5927*X*75% X=500*95*p\u5c0f/75*p\u5927\uff0c75%\u7684\u9152\u7cbe\u7684\u8d28\u91cf\u4e3a500*95*p\u5c0f/75 g \u800c\u539f\u676595%\u7684\u9152\u7cbe\u7684\u8d28\u91cf\u4e3a500*p\u5c0f\u3002
\u6839\u636e\u8d28\u91cf\u5b88\u6052\uff0c\u5f97\u77e5\u52a0\u5165\u7684\u6c34\u7684\u8d28\u91cf\u4e3a75%\u9152\u7cbe\u7684\u8d28\u91cf-95%\u9152\u7cbe\u7684\u8d28\u91cf=20*500*p\u5c0f/75g\uff0c\u6c34\u7684\u5bc6\u5ea6\u4e3a1g/cm3\uff0c\u6545\u52a0\u5165\u7684\u6c34\u7684\u4f53\u79ef\u4e3a 20*500*p\u5c0f/75 ml\uff0c\u6240\u4ee5\u7ea6\u7b49\u4e8e133.33ml \u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u6ce8\u610f\u4e8b\u9879\uff1a
\u9152\u7cbe\u5c31\u662f\u4e59\u9187\uff0c\u4e0d\u540c\u7684\u6d53\u5ea6\u7684\u9152\u7cbe\u6709\u4e0d\u540c\u7684\u529f\u6548\u4e0e\u4f5c\u7528\u300270%-75%\u7684\u9152\u7cbe\u6eb6\u6db2\u6740\u83cc\u529b\u6700\u5f3a\uff0c\u56e0\u4e3a\u6d53\u5ea6\u8fc7\u9ad8\uff0c\u53ef\u4f7f\u83cc\u4f53\u8868\u9762\u86cb\u767d\u51dd\u56fa\uff0c\u800c\u4f7f\u9152\u7cbe\u4e0d\u6613\u5411\u5185\u900f\u5165\uff0c\u59a8\u788d\u5176\u6740\u83cc\u6548\u529b\uff0c\u4e3b\u8981\u7528\u4e8e\u76ae\u80a4\u53ca\u5668\u68b0\u6d88\u6bd2\u3002
40%-50%\u7684\u9152\u7cbe\u53ef\u4f7f\u8840\u7ba1\u6269\u5f20\uff0c\u589e\u52a0\u8840\u6db2\u5faa\u73af\uff0c\u7528\u4e8e\u64e6\u62ed\u4e45\u5367\u75c5\u5e8a\u7684\u75c5\u4eba\uff0c\u53ef\u4ee5\u9884\u9632\u8925\u75ae\u7684\u53d1\u751f\u300220%-30%\u7684\u9152\u7cbe\u64e6\u6d74\uff0c\u7528\u4e8e\u9ad8\u70ed\u75c5\u4eba\u7269\u7406\u9000\u70ed\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-75%\u9152\u7cbe
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u533b\u7528\u9152\u7cbe
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u6c34
没告诉两种浓度溶液的密度,这题做不了
不过你要是初中生或者小学生的话 就可以设为X毫升
500*95%=(500+x)*75%
溶质质量不变,设75%的酒精质量x
500.95%:X.75%
x≈633.3
因溶质不变
633.3-500=133.3的水
绛旓細绾133ml. 75%娴撳害鏃剁殑鎬诲绉紝633.33ml.闇鍔犳按涓猴紝=633.33*0.25-500*0.05=133.33(ml)
绛旓細鑷埗姹借溅鐜荤拑姘存槸涓椤圭畝鍗曟槗琛岀殑DIY浠诲姟銆傚彧闇灏500姣崌娴撳害涓95%鐨勯厭绮俱2鍗囩函鍑姘翠互鍙婇傞噺鐨勬礂娲佺簿娣峰悎鎼呮媽锛屽嵆鍙交鏉捐幏寰楄繖娆剧粡娴庡疄鎯犵殑鐜荤拑姘淬傚畠涓嶄粎鎴愭湰浣庯紝鏁堟灉杩樼浉褰撳嚭鑹层傚湪姹借溅缁存姢涓紝鐜荤拑姘村彂鎸ョ潃涓嶅彲鎴栫己鐨勪綔鐢紝鍏峰澶氱鍔熸晥锛氭竻娲佹晥鑳: 鑷埗鐜荤拑姘翠腑鍚湁涓板瘜鐨勮〃闈㈡椿鎬у墏鍜屾坊鍔犲墏锛岃繖浜...
绛旓細鍏堢湅鍓嶆彁锛500ml鐨95%鐨勯厭绮撅紝鎵浠ヨ绠楀嚭鍏朵腑閰掔簿鐨勫惈閲忥細閰掔簿鍚噺=500ml脳95锛=475ml 鍔犱笂150ml姘村悗锛屾暣浣撲綋绉负锛500+150=650ml 鍏朵腑閰掔簿鏈475ml 鎵浠ラ厭绮惧惈閲=475梅650脳100锛呯害绛変簬73锛
绛旓細500姣崌闇瑕佸姞鍏133.33ml鐨勮捀棣忔按灏卞彲浠ラ厤鎴75%鐨勯厭绮句簡銆備互500姣崌95%閰掔簿閰嶆垚75%閰掔簿涓轰緥锛500ml鐨95锛閰掔簿涓惈閰掔簿锛500脳95锛咃紳475锛75%閰掔簿涓嫢鏈475鍏嬮厭绮撅紝鍏舵婚噸閲忎负475梅75锛咃紳633.33ml锛屾墍浠ラ渶瑕佸鍔犳按鐨勬婚噺涓猴細633.33锛500锛133.33ml銆傦紙钂搁姘达級...
绛旓細绛旓細璁鹃渶瑕佸姞姘磝姣崌 95%*500=70%*锛500+x锛墄=95*500梅70-500 x=1250/7 x鈮178.6 鎵浠ワ細闇瑕佸姞姘1250/7姣崌
绛旓細棣栧厛锛95%閰掔簿鐨勫瘑搴︾害涓0.81g/ml銆傛墍浠500ml95%閰掔簿閲屾憾璐ㄤ负500脳0.81脳95%=384.75g锛屽姞500ml姘村悗锛屾憾娑叉昏川閲忎负500脳0.81+500=905g锛屾渶缁堥厭绮娴撳害涓384.75/905鈮42.5
绛旓細500脳锛100/95-1锛=26.3ml 鍗冲皢500姣崌鐨100%閰掔簿涓26.3姣崌姘存贩鍚,鍙緱鍒95%鐨勯厭绮526.3姣崌.
绛旓細20 掳C鏃讹紝璐ㄩ噺鍒嗘暟涓95%閰掔簿鐨勫瘑搴︽槸0.8g/ml銆500ml95%閰掔簿鐨勮川閲锛500*0.8=400锛坓锛夛紝鍏朵腑閰掔簿閲忥細400*95%=380锛坓锛7%閰掔簿璐ㄩ噺锛380/7%=5428.6锛坓锛夐渶鍔犳按閲忥細5428.6-400=5028.6锛坓锛=5028.6锛坢l锛
绛旓細绋閲婁竴涓嬪嵆鍙傜█閲婂悗浣撶Н涓篤=500脳95锛梅75锛咃紝V=633.3 鐢ㄦ憾鍓傜█閲婂埌633.3姣崌鍗冲彲銆
绛旓細濡傛灉鎮ㄦ兂灏嗘祿搴︿负99%鐨勫啺閱嬮吀绋閲婃垚杈冧负瀹夊叏鍜岀ǔ瀹氱殑娴撳害锛屽彲浠ユ寜鐓т互涓嬫瘮渚嬪皢鍏剁█閲锛氬皢500姣崌娴撳害涓99%鐨勫啺閱嬮吀鍊掑叆涓涓ぇ瀹归噺瀹瑰櫒涓傛參鎱㈠湴銆佸厖鍒嗗湴鍔犲叆400姣崌宸﹀彸鐨勫喎寮姘达紙鎴栧叾浠栭傚悎绋閲婄殑婧舵恫锛夛紝骞朵笖鍏呭垎鎼呮媽鍧囧寑銆