document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=910752>Question 910752</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A scientist has a beaker contain 20 mL of a solution containing 20% acid.  To dilute this pure water is added.<BR>\n" );
document.write( "a.  Write the equation for the concentration in the beaker after adding n mL of water.<BR>\n" );
document.write( "b.  Find the concentration if 10 mL of water is added<BR>\n" );
document.write( "c.  How much mL of water must be added to equal 4%<BR>\n" );
document.write( "d.  what is the behavior as n approaches infinity, and what is the physical significance of this? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #552648 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=552648\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A scientist has a beaker contain 20 mL of a solution containing 20% acid. To dilute this pure water is added.<BR>\n" );
document.write( " a. Write the equation for the concentration in the beaker after adding n mL of water.<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "acid + acid = acid<BR>\n" );
document.write( "0.20*20 + 0*n = x(20+n)<BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( " b. Find the concentration if 10 mL of water is added<BR>\n" );
document.write( "0.20*20 + 0*10 = x(20+10)<BR>\n" );
document.write( "Multiply thru by 100 to get::<BR>\n" );
document.write( "20*20 + 0 = x(3000)<BR>\n" );
document.write( "x = 400/(3000<BR>\n" );
document.write( "x = 13.3%<BR>\n" );
document.write( "----------------<BR>\n" );
document.write( " c. How much mL of water must be added to equal 4%<BR>\n" );
document.write( "0.20*20 + 0*n = 0.04(20+n)<BR>\n" );
document.write( "20*20 + 0 = 4(20+n)<BR>\n" );
document.write( "100 = 20+n<BR>\n" );
document.write( "n = 80 ml<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( " d. what is the behavior as n approaches infinity, and what is the physical significance of this?<BR>\n" );
document.write( "As more and more water is added the concentration approaches 0%<BR>\n" );
document.write( "=============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "----------------- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );