取5ml溶液加水稀释至刻度，再取稀释溶液5ml里含原液0.25请问要加多少水稀释？ 取5ml溶液,加多少水稀稀至取5ml含原液的0.25？
\u53d6\u6eb6\u6db25ml\uff0c\u52a0\u6c34\u7a00\u91ca\u81f3\u523b\u5ea6\uff0c\u53d6\u7a00\u91ca\u6db25ml\uff0c\u8fd9\u7a00\u91ca\u6db25ml\u91cc\u8981\u542b\u539f\u6db20.25\uff0c\u8bf7\u95ee\u8981\u52a0\u591a\u5c11\u6c34\u7a00\u91ca\uff1f\u8981\u52a095\u6beb\u5347\u6c34\uff0c0.25\u9664\u4ee55\u7b49\u4e8e5%\uff0c5\u9664\u4ee55%\u7b49\u4e8e100\uff0c100\u51cf5\u7b49\u4e8e95
1\u3001\u8ba1\u7b97\uff1a\u6839\u636e\u7a00\u91ca\u524d\u540e\u6eb6\u8d28\u4e0d\u53d8\uff0c\u7acb\u5173\u7cfb\u5f0f\uff0c\u5e76\u8ba1\u7b97\u9700\u52a0\u5165\u7684\u6c34x\u3002
c1*v1=c2*v*2 \uff085+x\uff09*c*0.25=5*c x=15
2\u3001\u914d\u5236\uff1a\u5728\u70e7\u676f\u4e2d\uff0c\u5c0615ml\u7684\u6c34\u7a00\u91ca\u5230\u539f\u6eb6\u6db2\u4e2d\uff0c\u73bb\u68d2\u6405\u62cc\u5373\u53ef\uff1b\u5982\u679c\u539f\u6eb6\u6db2\u662f\u6d53\u786b\u9178\uff0c\u5219\u7a00\u91ca\u65f6\uff0c\u8981\u5c06\u539f\u6eb6\u6db2\u6162\u6162\u5012\u5165\u523015ml\u6c34\u4e2d\uff0c\u5e76\u4e0d\u65ad\u6405\u62cc\u3002
【1】以下是一种方案，容量瓶的体积为10ml：
1、原液稀释到刻线的容量瓶的体积是10ml：原液含量是5/10= 0.5 ；
2、再取稀释溶液5ml里，含原液5 x 0.5 = 2.5
3、应该在稀释 10倍，即为0.25。所以应该加45ml水，即为50ml溶液。
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