Topic: Congo Red
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What is Congo Red?
Congo red is the sodium salt of benzidinediazo-bis-1-naphtylamine-4-sulfonic acid (formula: C 32 H 22 N 6 Na 2 O 6 S 2 ). It is a secondary diazo dye. Congo red is water soluble, yielding a red colloidal solution; its solubility is better i... Read More »
Source: http://wiki.answers.com/Q/What_is_Congo_Red?src=ansTT
What is congo red test?
( ′käŋ·gō ′red ′test ) (pathology) Diagnostic test for amyloidosis, in which congo red is injected intravenously; 30% disappears within 1 hour in normal individuals, but in amyloidosis 40-100% disappears. Read More »
Source: http://www.answers.com/topic/congo-red-test
What are the applications of Congo red dye?
Congo red dye is a synthetic reactive water soluble dye: � used in medicine (as a biological stain) � and as an indicator since it turns from red-brown (in basic medium) to blue in acidic one. � It is also used to color textiles (initially ... Read More »
Source: http://wiki.answers.com/Q/What_are_the_applications_of_congo_red_...
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Congo Red
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Answers to Other Common Questions
We think it is about 4, based on the lab we just did, but sometimes we make mistakes!
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Source: http://wiki.answers.com/Q/What_is_the_pKa_value_of_congo_red
congo red: a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
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Source: http://www.kgbanswers.com/what-is-the-meaning-of-congo-red/133037...
An indicator.
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Source: http://www.answerbag.com/q_view/1751567
1. a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
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Source: http://www.audioenglish.net/dictionary/congo_red.htm
Because negative staining requires the use of an acidic stain, which will not penetrate the cells because of the negative charge on the surface of the bacteria. As a result, the unstained cells can be easily identified against the colored b...
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Source: http://wiki.answers.com/Q/Why_can't_methylene_blue_be_used_in_pla...
_____(4-H2N)-Ph-Ph-(4-NH2)+ 2NaNO2+4HCl--> (4-ClN[triple bond]N)-Ph-Ph-(4-N[triple bond]NCl) +2NaCl+4H2O _____(4-ClN[triple bond]N)-Ph-Ph-(4-N[triple bond]NCl) +2NAPHTIONIC ACID------>CONGO RED NAPHTIONIC ACID= http://www.sigmaaldrich.com/c...
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Source: http://answers.yahoo.com/question/index?qid=20090308052856AALvvrH
