document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=767683>Question 767683</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help me solve this problem \r<BR>\n" );
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document.write( "The pH of a solution is 8.1, mildly alkaline. What is the concentration of hydronium ions in the solution?<BR>\n" );
document.write( "(p = -log[c], where p is pH and c is the concentration.) \r<BR>\n" );
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document.write( "c value (E notation, 1 decimal)??? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #467780 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=467780\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> logarithm is defined as<BR>\n" );
document.write( "y = log to base b of x<BR>\n" );
document.write( "if b is not stated then we are to assume base 10, in our case we have<BR>\n" );
document.write( "8.1 = -log[c}<BR>\n" );
document.write( "(-1) * (-1) = +, implies that 8.1 = -(-8.1) = 8.1<BR>\n" );
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document.write( "from definition of logarithm<BR>\n" );
document.write( "if y = log(x) then<BR>\n" );
document.write( "x = b^y<BR>\n" );
document.write( "therefore<BR>\n" );
document.write( "c = 10^(-1)8.1<BR>\n" );
document.write( "c = 7.9 X 10^-9 or 7.9 X e^-9<BR>\n" );
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document.write( "check value<BR>\n" );
document.write( "pH = -log(7.9 X 10^-9)<BR>\n" );
document.write( "pH = -(-8.1)<BR>\n" );
document.write( "pH = 8.1 </SPAN>\n" );
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