Difference between revisions of "Neutral red"

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== Description ==
 
== Description ==
  
A dark green powder that dissolves in [http://cameo.mfa.org/materials/fullrecord.asp?name=water water] or [http://cameo.mfa.org/materials/fullrecord.asp?name=ethyl alcohol ethanol] to form a red solution. Neutral red is used as an indicator for alkalinity of water and [http://cameo.mfa.org/materials/fullrecord.asp?name=urea urea]. It is red below pH 6.8 and yellow above pH 8.0. It is also used to prepare neutral red indicating paper.
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A dark green powder that dissolves in [[water|water]] or [[ethyl%20alcohol|ethanol]] to form a red solution. Neutral red is used as an indicator for alkalinity of water and [[urea|urea]]. It is red below pH 6.8 and yellow above pH 8.0. It is also used to prepare neutral red indicating paper.
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
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[[[SliderGallery rightalign|neutral red.jpg~Chemical structure]]]
 
[[[SliderGallery rightalign|neutral red.jpg~Chemical structure]]]
  
== Other Properties ==
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== Risks ==
  
Soluble in water, ethanol producing a red colorInsoluble in xylene.
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* Contact may cause irritation.   
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* Fisher Scientific: [https://fscimage.fishersci.com/msds/01897.htm MSDS]
  
Absorption max. = 533 nm
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== Physical and Chemical Properties ==
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* Soluble in water, ethanol producing a red color.  Insoluble in xylene.
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* Absorption max. = 533 nm
  
 
{| class="wikitable"
 
{| class="wikitable"
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|-
 
|-
 
! scope="row"| Melting Point
 
! scope="row"| Melting Point
| 290
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| 290 C
 
|-
 
|-
 
! scope="row"| Molecular Weight
 
! scope="row"| Molecular Weight
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|}
 
|}
  
== Hazards and Safety ==
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==Resources and Citations==
 
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* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
Contact may cause irritation. 
 
 
 
Fisher Scientific: [https://fscimage.fishersci.com/msds/01897.htm MSDS]
 
 
 
== Authority ==
 
 
 
* Richard S. Lewis, Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
 
  
 
* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983  Comment: entry 6571
 
* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983  Comment: entry 6571

Latest revision as of 15:25, 9 August 2022

Description

A dark green powder that dissolves in Water or ethanol to form a red solution. Neutral red is used as an indicator for alkalinity of water and Urea. It is red below pH 6.8 and yellow above pH 8.0. It is also used to prepare neutral red indicating paper.

Synonyms and Related Terms

toluylene red; neutral red chloride; nuclear fast red; Michrome no. 226; 3-amino-7-(dimethylamino)-2-methylphenazine monohydrochloride; Basic Red 5; CI 50040

Chemical structure

Neutral red.jpg


Risks

  • Contact may cause irritation.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

  • Soluble in water, ethanol producing a red color. Insoluble in xylene.
  • Absorption max. = 533 nm
Composition C15H17ClN4
CAS 553-24-2
Melting Point 290 C
Molecular Weight mol. wt. = 288.77

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6571