The TW1009 colorimeter is used to measure the transmittance of the solution and the reaction rate of chemical reactions with color or transparency in the reaction process.
Principle
A colorimeter is used to measure the transmittance of the solution. The advantage of the light-emitting two level tube as the light source is that it will not heat the solution studied. The closing cover can prevent the environment from entering the test area. It provides 4 colors of light source. Users can choose the wavelength of light in the research process: red, purple, blue and green. The colorimeter provided is optical quartz material, and its volume is 4.1cm3.
When a beam of parallel monochromatic light passes through a uniform non scattering sample, the beam is exponentially decaying when it propagates in the liquid. The degree of attenuation has a simple relationship with the properties and concentrations of the liquid and the path passed by the light.
I=I0e- CD A=lg (1/T) =Kbc
I0: incidence of monochromatic light intensity; I: through light intensity; D: light path length; C: concentration of absorbant (mole concentration); the molar absorption coefficient of the absorbant; it is related to the properties of the absorbing material and the wavelength of the incident light; T=I/I0: transmittance; T= I/I0*100%: transmittance.
Specifications
| measuring Range | 0~100% |
| Resolution | 0.02% |
| Accuracy | ±2% |
Typical experiments
1.Effect of concentration on the rate of chemical reaction -- Potassium Permanganate solution and oxalic acid solution by reaction.
2.The effect of 2. concentration on the reaction rate -- sodium thiosulfate reaction with concentrated sulfuric acid.
3.Determination of vitamin C content in 3. Juice.
Determination of substance concentration in solution (Bill's law).
Usage
- The colorimeter is directly connected to the computer with USB line before being used. When it is used for the first time, if the numerical deviation is large, it can be reset.
- The 2. colorimeter is connected to the computer after boot. Click the colorimeter button to adjust the wavelength of different wavelengths: red, violet, blue and green.
- Every time we use the colorimeter, we need to wash the colorimetric dish with distilled water and wipe the water stains with absorbent paper.
- Low power reminding: USB power is not inserted and when the battery is low, the word "Lo" will flicker on the screen; USB power is inserted, no matter whether the battery is low or not.
Note
- When the first time is used, if the numerical deviation is large, the reset operation can be done.
- Every time we use the colorimeter, we need to wash the colorimetric dish with distilled water and wipe the water stains with absorbent paper.
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