document.write( "Question 834596: You have 4L of an 90% aqueous solution of hydrochloric acid. You want 1L of a 25% solution. How much of the stock solution do you need to use? \n" ); document.write( "

Algebra.Com's Answer #503090 by Edwin McCravy(20056) $\"\"$ $\"About$

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You have 4L of an 90% aqueous solution of hydrochloric acid. You want 1L of a 25% solution. How much of the stock solution do you need to use?
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document.write( "You are going to add water to the stock solution to make 1 liter.\r\n" );
document.write( "Make this chart:\r\n" );
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document.write( "                 |         |           | Liters of\r\n" );
document.write( "                 |Liters of|   Percent | pure acid \r\n" );
document.write( "                 | liquid  |    Acid   | contained\r\n" );
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document.write( "stock solution   |   x     |  90%=0.90 |   0.90x           \r\n" );
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document.write( "water            |  1-x    |   0%=0.00 | 0.00(1-x)  \r\n" );
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document.write( "final solution   |   1     |  25%=0.25 |  0.25(1)\r\n" );
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document.write( "Answer:  ths of a liter of stock solution, and ths of a liter of water.\r\n" );
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document.write( "Edwin

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