document.write( "Question 980554: I need to mix a cleaning solution that would spray out of a bottle and contain 70% rubbing alcohol to clean lab surfaces. To save cost, it makes sense to add water to some amount of alcohol yet maintain the 70% level. Average spray bottles likely hold about 25 fl ounces or what about 800 ml? What should my solution look like? Thank you. Leann \n" ); document.write( "

Algebra.Com's Answer #601698 by josgarithmetic(39618) $\"\"$ $\"About$

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What are your materials? If you add some amount of water to 70% alcohol, then you will obtain a concentration of alcohol LESS THAN 70%.\r
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\n" ); document.write( "\n" ); document.write( "If you are starting with 100% alcohol and want to add some water to prepare 25 fluid ounces of 70% alcohol, then ...\r
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\n" ); document.write( "\n" ); document.write( "v, volume of the \"pure\" alcohol of 100%;
\n" ); document.write( "25-v, volume of the water to add;\r
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\n" ); document.write( "\n" ); document.write( " $\"%28100%2Av%2B0%2A%2825-v%29%29%2F25=70\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"%28100v%29%2F25=70\"$
\n" ); document.write( "Find v, and then find 25-v. \n" ); document.write( "

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