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Potassium Chromate PWD

Potassium Chromate supreme supplier, manufacturers and exporters.  Potassium Chromate is a yellowish, crystalline, inorganic compound that emits toxic chromium fumes upon heating. Potassium chromate is highly corrosive and is a strong oxidizing agent.
Article News:
,
Active Matter:
99.5
IMPA Code:
550947, 550948
Packing Size:
250.00 Grams
Available Packing Size:
Potassium Chromate is a yellowish, crystalline, inorganic compound Potassium chromate is a strong oxidizing agent.
Code:
RXSOL-60-6112-250
Potassium Chromate PWD
Application:
Yellow crystals, soluble in water. Hazard: Toxic By ingestion and inhalation. Used: Reagent in analytical chemistry, aniline black, chromate pigments.  
Using Procedure:
Potassium Chromate is used in the qualitative inorganic analysis to detect the ions in aqueous solution. Potassium chromate is used in the manufacture of dyes. Potassium chromate is used in precipitation titra [+] Read More...
Note:
Potassium chromate primarily affects the nose, throat and lungs causing ulcerations, shortness of breath, bronchitis, pneumonia and asthma but can also affect the gastrointestinal tract, liver, kidneys and im [+] Read More...
Technical Specifications:

 

Physical State Solid
Appearance yellow
Odor odorless
pH 8.6-9.8 (5% soln)
Vapor Pressure 0
Vapor Density Not applicable
Evaporation Rate Not applicable
Viscosity Not applicable
Boiling Point Not available
Freezing/Melting Point 975 deg C
Autoignition Temperature None reported
Flash Point Not available
Decomposition Temperature Not available
NFPA Rating (estimated) Health:
2; Flammability: 0;
Reactivity: 0
Explosion Limits, Lower None reported
Upper None reported
Solubility Soluble
Specific Gravity/Density 2.7320
Molecular Formula K2CrO4
Molecular Weight 194.20
Remarks:

 

Assay 

:

Min.99.5 %

pH ( 20' c; 5 %)

:

8.6 to 9.8

Insolubility in water 

:

Max. 50 ppm 

CI (CHLORIDE)

:

Max. 10 ppm

SO4 (sulphate)

:

Max. 100 ppm 

Ca ( Calcium)

:

Max. 50 ppm

Cu  ( Copper ) 

:

Max  10 ppm

Fe ( Iron)

:

Max. 15 ppm

Na ( sodium )

:

Max 0.03%

Pb ( Lead)

:

Max  50 ppm

 

Potassium chromate is a yellow crystalline solid. It is soluble in water. The primary hazard is a threat to the environment. Immediate steps should be taken to limit its spread to the environment.

Potassium Chromate is used as an indicator in the determination of Chloride by titration with standard Silver Nitrate solution. This method is called the Mohr method of determining Chloride and is based on the formation of a red precipitate of Silver Chromate at the endpoint after all of the Chloride has been precipitated as white Silver Chloride. A 5% solution of Potassium Chromate that has been Chloride neutralized (Group No. 6000) is commonly used. Approximately 1 mL of this indicator should be used per 100 mL of sample volume.

 

The accuracy of the Mohr method decreases as the Silver Nitrate concentration decreases due to the amount of excess Silver Nitrate that must be added to produce enough Silver Chromate to be seen visually. The Mohr method must also be performed in the pH range of 6.5 to 9. If the pH is too high, brownish Silver Hydroxide forms and masks the endpoint. If the pH is too low, the Chromate is converted to Dichromate and the endpoint comes too late or can not be perceived at all. In the presence of Ammonium ions, the pH must be kept below 7.2 to prevent partial conversion of the precipitate to soluble Ammine complexes.

For comparison purposes, all Mohr titrations should be carried out at about the same temperature, since the solubilities of Silver Chloride and Silver Chromate depend on temperature. Good stirring during the addition of the Silver Nitrate is also required; otherwise, Silver Chromate that forms locally before the endpoint can become occluded in the Silver Chloride precipitate instead of redissolving. Poor agitation could lead to an endpoint that is neither sharp nor reproducible. The reactions for the Mohr titration are:

Ag+ + Cl- → AgCl (white precipitate)

2 Ag+ (excess) + CrO42- → Ag2CrO4 (red precipitate at endpoint)

Potassium chromate supplier in India with stock point at Mumbai, Kandla - Gandhidham, Surat, Kolkata, Chennai, Visakhapatnam and in Middle East stock point at Dubai, fujairah, sharjah, abudhabi and in OMAN.

Potassium Chromate
Chemical Formula K2CrO4
Formula Weight 194.19
CAS No. 7789-00-6
 

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Potassium Chromate PWD

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