the pKin is 6.856
An acid-base indicator, Hin, dissociates according to the reaction shown in an aqueous solution. K. HIn...
Please answer the following question completely and correctly. Please underline the answer. An acid-base indicator, HIn, dissociates according to the following reaction in an aqueous solution. K, The protonated form of the indicator, Hin, has a molar absorptivity of 2575 M1 cm 1and the deprotonated form, In, has a molar absorptivity of 17640 M1 cm at 440 nm. The pH of a solution containing a mixture of Hln and In is adjusted to 6.03. The total concentration of Hln and...
Please help! You would like to create a reflection grating like the one shown, with an incident angle (0) of 40°. Calculate the number of lines per centimeter that should be etched in the grating for cach condition. Incident light d Emerging light A first order diffraction angle (6) of -31° for visible light with a wavelength of 550 nm. lines per centimeter: lines/cm A first order diffraction angle () of -31° for infrared light with a wavelength of 0.00500...
A mixture is prepared using 27.00 mL of a 0.0786 M weak base (pKa 4.635), 27.00 mL of a 0.0590 M w Map acid (pKa 3.252) and 1.00 mL of 0.000105 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1063. The molar absorptivity (E) values for HIn and its deprotonated form In at 550 nm are 2.26 x104 Mcmand 1.53x104 M-cm1 respectively....
Q2. Consider a solution of an indicator (HIn) with an acid dissociation constant of 1.42x10 5and a molar absorptivities of the indicator species at 430 nm and 570 nm are (HIn in 0.1 M HCl is 6.30x10 and 7.12 x 10') and for (In in 0.1 M NaOH is 2.06x 10 and 9.60 x 10). (5.5 marks) a) What are the concentration of [HIn] and [In] b) Calculate the absorbances at two wavelengths for the dissociation process using 1.00 cm-cells?...
An aqueous solution contains two absorbing species, X and Y. When a solution of this mixture is put into a 5.000 cm cell, the total absorbance of a mixture of X and Y at 300 nm is 0.372, while at 250 nm it is 0.478. The individual molar absorptivities of X and Y are as listed below. What are the individual concentrations of X and Y in this mixture? 250 nm 300 nm eX 4.05 x 104 M-1 cm-1 3.22...
Consider absorption spectrophotometry performed at 490 nm. A chemical species with an aqueous solution concentration of 0.250 M gives an absorbance of 0.385 with a path length of 1.00 cm. A. What is the frequency in Hz of 490 nm radiation? B. What is the energy of a photon of 490 nm radiation C. What is the molar absorptivity () at 490 nm? D. What is the percentage transmission of a solution that has an absorbance of 0.385 ?
The logarithm (log10) of the molar absorptivity of uric acid is 4.086 in neutral aqueous solution at 293 nm. Calculate the range of uric acid concentrations that can be used in a uric acid assay if the absorbance must be greater than 0.100 and less than 2.000 with a 1.25 cm cell 4.
At what pH would an aqueous solution of benzoic acid be present as 99% conjugate base (benzoate)? (Hint: you will need to know the pKa of benzoic acid)? At what pH would an aqueous solution of m-nitroaniline be present as 99% conjugate acid (m-nitroanilinium, the protonated form)?
Spectrophotometric properties of a particular indicator are given below. A solution with a volume of 20.0 mL containing 1.40 times 10^-5 M indicator plus 0.050 M benzene-1, 2, 3-tricarboxylic acid was treated with 20.0 ml. of aqueous KOH. The resulting solution had an absorbance at 604 nm of 0.148 in a 1.00 cm cell. Calculate the molarity of the KOH solution.
A solution containing a mixture of the compounds X and Y had an absorbance of 0.906 at 443 nm and an absorbance of 0.778 at 520 nm when measured with a 1.00 cm cell. The molar absorptivities (ε) of X and Y at each wavelength are shown in the table below. wavelength Molar Absorptivity (E M^-1cm^-1) Lambda,nm X Y 443 1.600x10^4 3775 520 3893 6264 What are the Concentration of X and Y. Thank you!!