How does holmium oxide dissolve in perchloric acid?
The aqueous solutions of holmium oxide in 10% perchloric acid were prepared by weighing 2, 4, or 6 g of the oxide and adding 10 mL of distilled water and 10 mL of perchloric acid. The holmium oxide was dissolved by heating at about 80 °C for one hour.
How do you make holmium oxide solution?
Chemicals required: 1.4 M perchloric acid, Holmium perchlorate solution.
- Preparation of 1 .
- Preparation of Holmium Perchlorate solution:Dissolve about 1.0 gm of Holmium oxide in 1.4 M Perchloric acid with the aid of heating on a water bath, cool and dilute to 25 ml with same solvent.
Why holmium oxide is used in UV calibration?
Product Description. Holmium has been used as a wavelength reference for many years and now we have extended the use by creating a filled and sealed quartz cell which allows you to verify your wavelength scale into the Ultraviolet. Holmium offers sharp, stable peaks over the range of 219nm to 650nm.
How do you prepare 1.4 molar perchloric acid?
Preparation of 1.4 M Perchloric acid solution:
Take 50 ml water in 100 ml volumetric flask add Perchloric acid 70 % about 11.50 ml (11.48 ml) diluted with water.
What is holmium oxide used for?
Holmium oxide is used in making specialty colored glasses. Glass containing holmium oxide and holmium oxide solutions have a series of sharp optical absorption peaks in the visible spectral range. They are therefore traditionally used as a convenient calibration standard for optical spectrophotometers.
What is resolution in UV calibration?
For wavelength accuracy: at 656.1 ± 0.3 nm & at 486.0 ± 0.3 nm. Resolution: 1.0 nm or less.
Why do we use KCL in UV calibration?
The potassium chloride liquid filter (UV1) consists of 12g/l potassium chloride dissolved in pure water. This filter is suited to check the stray light of a spectrometer in the spectral range between 190 nm and 210 nm, its cut-off is at about 200 nm.
Why is KCL used in UV calibration?
Which solvent is used for preparation of 0.1 N perchloric acid?
Take about 500 ml of anhydrous glacial acetic acid & about 25 ml Acetic anhydride in a cleaned and dried 1000 ml volumetric flask. Add about 8.5 ml of Perchloric acid (About 70%) with continues stirring. Cool the solution. Make up the volume 1000-ml with anhydrous glacial acid.
How do you make 1m perchloric acid?
1 M Perchloric acid:
244252; MW 100.46; d = 1.664 (g/mL); 70% assay; 11.59 M) Add 8.6mL perchloric acid to 92.4 mL of distilled water and mix thoroughly.
Where is holmium used?
Holmium alloys are used as a magnetic flux concentrator to create the strongest artificially-generated magnetic fields. It is also used in nuclear reactors for nuclear control rods. Holmium oxide is used as yellow gas colouring.
Why KCL is used in UV calibration?
Why k2cr2o7 is used in UV calibration?
Why we use potassium dichromate to calibrate the UV-Spectrophotometer . Because k2cr2o7 is stable and having high molar mass, it shows characteristic known wavelengths at 235,257,313 and 430 at specified dilutions!
Which solution is used for UV calibration?
Calibration of the UV spectrophotometer including control of absorbance using potassium dichromate solution, resolution power using toluene in hexane, limit of stray light and wavelength accuracy.
What is the pH of perchloric acid?
Answer and Explanation:
The pH of the perchloric acid solution is 1.55. The pH of an acid can be calculated by taking the negative log of the hydrogen ion concentration in the solution. Perchloric acid has the formula HClO4 . There is one hydrogen ion in each hydrogen perchlorate molecule.
How do you make 0.1 normal perchloric acid?
Preparation and Standardization of 0.1 N Perchloric acid
- Take about 500 ml of anhydrous glacial acetic acid & about 25 ml Acetic anhydride in a cleaned and dried 1000 ml volumetric flask.
- Add about 8.5 ml of Perchloric acid (About 70%) with continues stirring.
- Cool the solution.
Which primary standard is used for standardization of perchloric acid?
A solution of perchloric acid was prepared and standardized using the primary standard Na2CO3.
What does holmium react with?
It readily reacts with diluted acids but does not react with either diluted or concentrated hydrofluoric acid (HF), due to formation of a protective surface layer of HoF3. Holmium is a very strong paramagnet above 133 K (−140 °C, or −220 °F).
Why do we need holmium?
Holmium can absorb neutrons, so it is used in nuclear reactors to keep a chain reaction under control. A magnetic pole piece with magnetic iron powder to demonstrate that Holmium has the highest magnetic strength of any element. Holmium is used in alloys for the production of magnets.
What is limit of stray light in UV?
Stray light becomes more of an issue as you approach the UV range (190-300 nm). So if you do a lot of work in the UV, checking your spectrophotometers stray light is a necessity. Stray light will not correct itself and will get worse over time.
How do you find the pH of perchloric acid?
1 Answer
- We use the pH equation, which states that,
- pH=−log[H+]
- And so, the pH will be,
- pH=−log[0.075]
- ≈1.12.
What is the pH of 0.1 m HClO4?
pH = 1.1
In the case of 0.1 M HClO4 (pH = 1.1), which is the electrolyte most usually reported on the literature, the onset potential in the presence of bromide is significantly displaced to more negative potentials.
How do you make 1 M perchloric acid?
Why acetic acid is added in preparation of perchloric acid?
The water introduced by the aqueous solution of Perchloric Acid used in the preparation of this nonaqueous titrant is converted to Acetic Acid by the addition of the appropriate amount of Acetic Anhydride to the titrant when it is made.
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| Perchloric Acid | |
|---|---|
| Chemical Formula | HClO4 |
| CAS No. | 7601-90-3 |