document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=811385>Question 811385</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You have 20% NaCl stock solution. You need to prepare 500 ml of a 0.5% NaCl solution? How many ml stock solution do you need to make this preparation? How much water will you add to the final product? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #488714 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=488714\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You have 20% NaCl stock solution. You need to prepare 500 ml of a 0.5% NaCl solution? How many ml stock solution do you need to make this preparation? How much water will you add to the final product?<BR>\n" );
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document.write( "N = amount of 20%<BR>\n" );
document.write( "W = amount of water<BR>\n" );
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document.write( "N + W = 500 (total solution)<BR>\n" );
document.write( "20*N + 0*W= 500*0.5 (total salt)<BR>\n" );
document.write( "20N = 250<BR>\n" );
document.write( "N = 12.5 ml of 20%<BR>\n" );
document.write( "487.5 ml of Water<BR>\n" );
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