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ctheowl
 2 years ago
Can anyone please help me? You need a 20% alcohol solution. On hand, you have a 400 mL of a 15% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?
ctheowl
 2 years ago
Can anyone please help me? You need a 20% alcohol solution. On hand, you have a 400 mL of a 15% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?

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princeofwetlot
 2 years ago
Best ResponseYou've already chosen the best response.0you can set upthe equation as: x mL of 100% alchohol + 400 mL of 15% alcohol = (x + 400) mL of 20% alcohol

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1you have 15% of 400 ml = \(.15\times 400=60\) ml of alcohol at present. if you add say \(x\) ml of alcohol you will have \(60+x\) ml of alcohol and \(400+x\) ml of solution you want \(400+x\) ml to be 20% alcohol, so set \[60+x=.20(400+x)\] and solve for \(x\)

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1probably easiest to multiply by 10 on both sides to get \[600+10x=2(400+x)\] \[600+10x=800+2x\] \[8x=200\] etc

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1yw hope steps are clear
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