Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Ripper Method
open-in-new
<p>The Ripper Method, developed in 1898, is an <a href="/facts/Analytical_chemistry/MHQf3YP6">analytical chemistry</a> technique used to determine the total amount of <a href="/facts/Sulfur_dioxide/jDK1fIDs">sulfur dioxide</a> (SO2) in a solution. This technique uses <a href="/facts/Iodine/JlfMecMf">iodine</a> standard and a <a href="/facts/Starch_indicator/WB5twtIR">starch indicator</a> to titrate the solution and determine the concentration of free SO2. The titration is done again with a new sample of the solution, but the sample is pretreated with <a href="/facts/Sodium_hydroxide/xjtdYtq7">sodium hydroxide</a> (NaOH) to release bound SO2. The result of these two titrations can then be used to determine the bound, free, and total amount of SO2 in the solution. Instead of using a starch indicator, an electrode can be used to determine the presence of free iodine. This technique is widely used in wine making. </p>