å©ç¨ 溶液ç¨éåå溶质çè´¨éä¸å å»è®¡ç®ã
1.100g溶质质éåæ°ä¸º10%çç¡é
¸é¾æº¶æ¶²ä¸æº¶è´¨çè´¨é为ï¼100g*10%ï¼10g
设15%ç溶液çè´¨é为Xï¼æ ¹æ®æº¶æ¶²ç¨éåå溶质çè´¨éä¸åï¼
100g*10%ï¼x * 15%
x=66.7g
æ以éè¦è¸åæ°´çè´¨é为100g-66.7g=33.3g
2.设éè¦å å
¥ç¡é
¸é¾çè´¨é为y
(10g+y)/ (100g+y)=15%
3.设éè¦å å
¥20%çç¡é
¸é¾æº¶æ¶²çè´¨é为z
100g*10% + z * 20%= (100g+z) * 15%
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