LITMUS Chemical Properties

Melting point:

100 °C

storage temp. 

Storage temp. 2-8°C

form 

Powder or Granules

color 

Dark blue to bluish-black

Specific Gravity

0.984

Odor

Odorless

PH Range

4.5(red)-8.3(blue)

Water Solubility 

Soluble in water

Merck 

14,5547

Stability:

Stable. Incompatible with strong oxidizing agents.

Safety Information

Hazard Codes 

Xn,Xi

Risk Statements 

40-36/37/38

Safety Statements 

24/25-36/37-36-26

WGK Germany 

3

HS Code 

32030010

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS

LITMUS Usage And Synthesis

Chemical Properties

blue powder

Uses

Litmus is a pH indicator, which is red at pH 4.5 and blue at pH 8.3.

Definition

A natural pigment that changes color when in contact with acids and alkalis; above a pH of 8.3 it is blue and below a pH of 4.5 it is red. Thus it gives a rough indication of the acidity or basicity of a solution; because of its rather broad range of color change it is not used for precise work. Litmus is used both in solution and as litmus paper.

Definition

litmus: A water-soluble dye extractedfrom certain lichens. It turnsred under acid conditions and blueunder alkaline conditions, the colourchange occurring over the pH range4.5-8.3 (at 25°C). It is not suitable fortitrations because of the wide rangeover which the colour changes, but is used as a rough indicator of acidityor alkalinity, both in solution and aslitmus paper (absorbent paper soakedin litmus solution).

References

[1] Manochehry S, et al Colorimetric Detection of Uranyl Using a Litmus Test. Front Chem. 2018 Aug 9;6:332. DOI:10.3389/fchem.2018.00332

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