A 2.845 g sample of an unknown compound containing cobalt(II) ion was dissolved in water in a 250 mL volumetric flask. The absorbance of this solution was found to be 0.2195 at 515 nm in a 1 cm cell. Using the values of absorbance obtained, calculate the percentage of cobalt in the unknown compound.

Q: Based on the absorption spectrum below, if n=1 for this element occupies an energy level of -21 eV,…

A: The expression of energy of a specific orbit for hydrogen like atoms is: En=-kZ2n2 = -13.6 eV ×Z2n2…

Q: 13. The calibration curve for spectrophotometric determination of phosphorus is shown below. The…

A: Hello. Since your question has multiple questions, we will solve the first question for you. If you…

Q: UV-Vis spectrophotometry is used to determine copper. Aside from UV-Vis spectrophotometry what other…

A:

Q: A metal has a threshold wavelength of 500 nm. a. What is the binding energy of the outer electron in…

A: a.)Threshold wavelength= 500nm = 500 × 10-9 m threshold frequency = c/λ = 3×108ms-1/500×10-9m…

Q: What procedures are utilized in optical analysis to determine a solution's concentration based on…

A:

Q: If the absorbance of 0.244 M copper (II) chloride solution is 0.534 and the path length of light is…

A: According to beer's law Absorbance of a light passing through the solution is directly proportional…

Q: A relationship between concentration in mg/dL and light absorption in absorbance units is given by…

A:

Q: 28 // If the effect of orbital spin leads to the splitting of the sodium spectrum line resulting…

A: Given that

Q: 1a.  A solution of dissolved ozone in water gives a percent transmittance of 83.4% when measured at…

A:

Q: 2. Referring to the colorimeter in this experiment, if a sample transmits sufficient light to cause…

A: Before solving #Q.3, we have to first solve #Q.2, because we need the value of % Transmittance of…

Q: A solution that absorbs at 450-470 nm wavelength can be perceived as what color? O Red O Yellow O…

A: the spectrum of visible light contains Red (high wave length and less energy) Orange  yellow  green…

Q: 2. The percentage of transmittance of a solution of X at 300 nm and 25 C is 20% for a 5x104 M…

A:

Q: A sample of a colored analyte at a concentration of 3.60 ´ 10-3 mol/L shows 34.2 percent…

A: #(a): Given the concentration of the analyte, C = 3.60*10-3 mol/L or M %T = 34.2 %

Q: A plot of Absorbance vs. molarity of Fe(SCN)2+ from part one of the lab gives a straight line with…

A: The equation of calibration curve line is given as, => y = 51 x Given : Absorbance of sample =…

Q: Given the following selectivity coefficients for a K+ ISE, which of the below ions would cause the…

A:

Q: Calculate the wavelength, frequency, and wavenumber of the n = 2 → n = 1 transition in He+.

A:

Q: Plot a graph of absorbance A vs. wavelength λ and determine the λ max (maximum wavelength)

A:

Q: A 0.035 g of KMnO4 was dissolved in 200 mL of distilled water. This solution had a transmittance of…

A:

Q: Copper was determined in an alloy sample by UV-visible spectrophotometry. The standard addition…

A:

Q: 4. A light pink, 0.050 M stock solution of cobalt (II) chloride (COCL) is analyzed by…

A: Since you have posted a question with multiple sub-parts, we will solve first three subpartsfor you.…

Q: An unknown amount of a compound with a molecular mass of 275.78 g/mol is dissolved in a 10 mL.…

A: According to Lambert Beer's law      A = € c l  Where A = Absorbance, € = molar absorptivity. c=…

Q: Calculate the wavelength, frequency, and wavenumber of the n = 5 → n = 4 transition in Li2+.

A: Given ion:  Li2+ n = 5 → n = 4

Q: Why is 800nm used for the wavelength when measuring the absorbance of the blue copper II sulfate…

A: Wavelength and light are related to each other.  If the light is passed through the prism , it emits…

Q: What are the advantages and disadvantages of using quantum dots for fluorescence imaging?

A: Quantum dots (QDs) are artificial clusters of semiconductive atoms that can confine the electrons…

Q: wavelengths. 요 λ = 219 nm

A:

Q: What is the frequency (in Hz) of low-level radiation from a fluorescent lamp with wavelength at 254…

A: Given, wavelength of radiation = 254 nm  we have to calculate the frequency of radiation…

Q: The drug tolbutamide (MW 270.0g/mol), a treatment for type 2 diabetes, has a molar absorptivity of…

A: The Beer-Lambert law is a linear relationship between the absorbance and the concentration, molar…

Q: The drug Tolbutamine (molar mass = 270) has a molar absorptivity of 703 at 262 nm. One tablet is…

A: The Absorbance of a Solution For each wavelength of light passing through the spectrometer, the…

Q: 2 students make solutions of CuCl2.2H2O using 25-mL volumetric flasks. student A weighs out 2.489g…

A: Given, volume of solution prepared = 25 mL            mass of CuCl2.2H2O weighed by student A =…

Q: Select the following statement that is not related to the principles of Atomic Absorption…

A: The instrumental method which is used to determine the structure of chemical compounds using…

Q: 2. The percentage of transmittance of a solution of X at 300 nm and 25 C is 20% for a 5x104 M…

A:

Q: Question attached

A: The absorbance of a sample is to be calculated, Given:

Q: 4. (a) Calculate the Doppler width (as a fraction of the transition wavelength) for any kind of…

A: Given: Temperature = 25 oC = 298 K Molar mass of HCl = 36.45 g/mol Let the transition wavelength be…

Q: Complete the information on these tables: wavelength 470 nm   conc Um absorbance % transmission…

A: 1. Absorbance is useful to relate concentration to the amount of light passing through the solution.

Q: 2. FeSCN'(aq) makes a dark orange colored solution (while Fe²* and SCN¯ are essentially colorless).…

A: A color wheel is a circle of colors which illustrate the relation between absorption and…

Q: 1. Write the balanced chemical equation for the reaction of NazS2O3 and HCl in aqueous solution. 2.…

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

Q: A solution containing the complex formed between two substances  has a molar absorptivity of 9.32 X…

A: Given, Molar absorptivity ε= 9.32  X103Lmol-1cm-1 at 470 nm of wavelength length = 1 cm

Q: The absorbance of an ionic aqueous solution is 0.387. What is the ratio of intensities of the…

A: The absorbance of a solution can be expressed as the negative logarithm of the ratio of incident…

Q: A sample of sodium phosphate is dissolved in water to give 100.00 mL of solution (Solution A). Then…

A: Answer:- This question is answered by using the simple concept of calculation of molar absorptivity…

Q: A 31 W (1 W = 1 J/s) lamp generates violet light at a wavelength of 420 nm. How many photons of this…

A: First calculate energy of one photon.

Q: A student creates a sports drink by dissolving 5.0 g of powder in 250 mL of water. The green colour…

A: Given: The amount of powder dissolved in 250 mL of water is 5.0 g. The value of the straight line…

Q: To determine the amount of iron thiocyanate in a polluted water sample. We prepared a series of…

A:

Q: A calibration curve is made for the absorbance as a function of concentration of blue dye (in mg/L).…

A: Beer-Lambert's law is expressed as: A = εCl A- Absorbance (unitless) ε- coefficient of molar…

Q: A solution containing 3.75mg/100 ml of analyte (X) 220 g/mol has a transmittance of 39.6% in a 1.00…

A: It is an application of Lambert Beer law  Here we are required to find the molar absorptivity and…

Q: 1. A solution of a dye absorbs light of wavelength 480 nm, and for this absorption, the extinction…

A: The answer to the following question is: The Beer-Lambert law states that there is relationship…

Q: Define the following terms: spectrophotometer, absorbance, pathlength, & (also known as molar…

A: Spectrophotometer: Spectrophotometer is an instrument that measures the amount of photons i.e.,…

Q: This are substances that absorbs short wavelength light (ultraviolet range) and then reemit the…

A: Acid is a species which can donate proton and base is a species which can accept a proton.…

Q: In determining the amount of copper and the identity of the copper compound in the unknown sample, a…

A:

Q: The frequency range of infrared light used in an IR spectrometer is 1.2x1014 Hz to 1.2x1013 Hz. What…

A: Given, The frequency range of infrared light used in an IR spectrometer is 1.2x1014 Hz to 1.2x1013…