document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=258174>Question 258174</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello,\r<BR>\n" );
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document.write( "Can someone please help me with this question?\r<BR>\n" );
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document.write( "What is the mathematical difference between a pH of 5.0 and a pH of roughly 4.0 - is it really that big of a difference?\r<BR>\n" );
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document.write( "Thank you for your help </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #190043 by </B><A HREF=/tutors/aboutme.mpl?userid=drk><B>drk(1908)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=drk><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=190043\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value. For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6. <BR>\n" );
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document.write( "The concentrations of hydrogen ions and indirectly hydroxide ions are given by a pH number. pH is defined as the negative logarithm of the hydrogen ion concentration. The equation is:\r<BR>\n" );
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document.write( "pH = - log [H+] <BR>\n" );
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document.write( "Example: If an acid has an H+ concentration of 0.0001 M, find the pH.<BR>\n" );
document.write( "Solution:<BR>\n" );
document.write( "First convert the number to exponential notation, find the log, then solve the pH equation.\r<BR>\n" );
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document.write( "H+ = 0.0001M = 10-4; log of 10-4 = -4;\r<BR>\n" );
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document.write( "pH = - log [ H+] = - log (10-4) = - (-4) = +4 = pH\r<BR>\n" );
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document.write( "The purpose of the negative sign in the log definition is to give a<BR>\n" );
document.write( "positive pH value.<BR>\n" );
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document.write( "The PH of coffee = 5<BR>\n" );
document.write( "The PH of orange juice = 4 </SPAN>\n" );
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