Caustic soda and copper sulfate are added to "x". The mixture becomes violet. What is "x" ?
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the most economical in use, it has become important to know the amino-acid ... as when the copper sulfate is added to the sodium hydroxide solution ... lestin + 10 Cc. 0.1 X. In solution. rC ... de solution, no sign of a violet tint being produced. ... formed may consist of a mixture of free edestin and copper hydrox- ide
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