document.write( "Question 1200052: What amount of pure acid must be added to 500 mL of a 25% acid solution to produce a 50% acid solution?
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Algebra.Com's Answer #834068 by ikleyn(52786) $\"\"$ $\"About$

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document.write( "Let V be the volume of the pure acid to add, in milliliters.\r\n" );
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document.write( "Then the total volume of the mixture is  (500+V) mL,\r\n" );
document.write( "and the volume of the pure acid is  (0.25*500+V).\r\n" );
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document.write( "Our concentration equation is\r\n" );
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document.write( "     = 0.50   (which is 50%).\r\n" );
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document.write( "It gives\r\n" );
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document.write( "    0.25*500 + V = 0.5*(500+V)\r\n" );
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document.write( "    0.25*500 + V = 0.5*500 + 0.5V\r\n" );
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document.write( "      V - 0.5V   = 0.5*500 - 0.25*500\r\n" );
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document.write( "        0.5V     =       125\r\n" );
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document.write( "           V     =  = 250.\r\n" );
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document.write( "ANSWER.  250 mL of the pure acid should be added.\r\n" );
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\n" ); document.write( "\n" ); document.write( "It is a standard and typical mixture problem.\r
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\n" ); document.write( "\n" ); document.write( "For introductory lessons covering various types of mixture word problems see\r
\n" ); document.write( "\n" ); document.write( "    - Mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - More Mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - Solving typical word problems on mixtures for solutions \r
\n" ); document.write( "\n" ); document.write( "    - Typical word problems on mixtures from the archive\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "You will find there ALL TYPICAL mixture problems with different methods of solutions,
\n" ); document.write( "explained at different levels of detalization, from very detailed to very short.\r
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\n" ); document.write( "\n" ); document.write( "Read them and become an expert in solution mixture word problems.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this textbook in the section \"Word problems\" under the topic \"Mixture problems\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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