Homework Answers
Here Beer- lambert law is used.
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The logarithm (log10) of the molar absorptivity of uric acid is 4.086 in neutral aqueous solution...
An acid-base indicator, Hin, dissociates according to the reaction shown in an aqueous solution. K. HIn...
An acid-base indicator, Hin, dissociates according to the reaction shown in an aqueous solution. K. HIn HIn(aq) In (aq) + H+ (aq) The protonated form of the indicator, HIn, has a molar absorptivity of 2089 M-.cm-1 and the deprotonated form, In, has a molar absorptivity of 14310 M-1.cm-1 at 440 nm. The pH of a solution containing a mixture of HIn and In is adjusted to 6.20. The total concentration of HIn and In is 0.000200 M. The absorbance of...
inorganic chem
1) a) Estimate the formula of Fe(III)-SSA complex (iron and SSA concentrations are equal to each other). Here is a crude example of the general shape of the graph:b) A solution is prepared by mixing 0.0121 M, 6.67 mL M and 0.0121 M, 13. 33 mL L and diluting to 100 mL. ϵ of the complex ML2 is 865 and the maximum absorbance is 0.612. Calculate Kf of the complex. c) The molar absorptivity for the complex formed between iron (III)...
An aqueous solution contains two absorbing species, X and Y. When a solution of this mixture...
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...
The pH of a solution is the negative logarithm of the molar concentration of hydronium ion,...
The pH of a solution is the negative logarithm of the molar concentration of hydronium ion, that is, pH=−log[H3O+] In neutral solutions at 25 ∘C, [H3O+]=10−7 M and pH=7. As [H3O+] increases, pH decreases, so acidic solutions have a pH of less than 7. Basic solutions have a pH greater than 7. Calculate the pH of a 0.10 M solution of HCl. Express your answer numerically using two decimal places.
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown belo...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
Please show work! A solution containing a mixture of the compounds X and Y had an absorbance of 1.06 at 443 nm and...
Please show work!
A solution containing a mixture of the compounds X and Y had an absorbance of 1.06 at 443 nm and an absorbance of 0.909 at 520 nm when measured with a 1.00 cm cell. The molar absorptivities (C) of X and Y at each wavelength are shown in the table. Wavelength (2. nm) Molar Absorptivity (M 'cm ) 3507 443 520 14860 3616 5818 What are the concentrations of X and Y in this mixture? Transmittance (%)...
answers for this pre/post lab Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species...
answers for this pre/post lab
Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species give rise to the orange color upon addition of 1,10-phenanthroline to an iron(II) solution? 2. How are percent transmittance and absorbance related algebraically? (Be able to convert %T to 4 and 4 to %7:) 3. What are the five fundamental components of a spectrophotometer? 4. State and define all terms (including units) in the Beer-Lambert law. 5. What is the purpose of preparing a...
• Consider disposing of 2 liter 18 Molar solution of sulfuric acid by pouring it down...
• Consider disposing of 2 liter 18 Molar solution of sulfuric acid by pouring it down the drain the faucet running. If the regulations required that any material put down the drain must have a pH greater than 2.0 and less than 12.5 in order to protect the aquatic environment and the bacteria in the local wastewater treatment plant not to mention the pipe in the sewerage system. There is two options to dispose of the acid safe and quickly:...
L. Explain why a solution of 0.10 M HNO(ag) conducts more electrical current than does a solution of 0.10 M formic acid, HCOOH. 2. Explain the observed trend in melting points in the hydrogen hal...
L. Explain why a solution of 0.10 M HNO(ag) conducts more electrical current than does a solution of 0.10 M formic acid, HCOOH. 2. Explain the observed trend in melting points in the hydrogen halides. HI HBr 88.5 °C HF 83.1 "C 14.8° Ethanol has a heat of vaporization of 38.56 kJ/msol and a normal boiling point of 78.4°C. what is the vapor 3. pressure ofethanol at 15 ℃ ? 4. One type of household bleach contains 455% sodium hypochlorite(NaOCl)...
An acid-base indicator, Hin, dissociates according to the reaction shown in an aqueous solution. K. HIn HIn(aq) In (aq) + H+ (aq) The protonated form of the indicator, HIn, has a molar absorptivity of 2089 M-.cm-1 and the deprotonated form, In, has a molar absorptivity of 14310 M-1.cm-1 at 440 nm. The pH of a solution containing a mixture of HIn and In is adjusted to 6.20. The total concentration of HIn and In is 0.000200 M. The absorbance of...
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...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
Please show work!
A solution containing a mixture of the compounds X and Y had an absorbance of 1.06 at 443 nm and an absorbance of 0.909 at 520 nm when measured with a 1.00 cm cell. The molar absorptivities (C) of X and Y at each wavelength are shown in the table. Wavelength (2. nm) Molar Absorptivity (M 'cm ) 3507 443 520 14860 3616 5818 What are the concentrations of X and Y in this mixture? Transmittance (%)...
answers for this pre/post lab
Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species give rise to the orange color upon addition of 1,10-phenanthroline to an iron(II) solution? 2. How are percent transmittance and absorbance related algebraically? (Be able to convert %T to 4 and 4 to %7:) 3. What are the five fundamental components of a spectrophotometer? 4. State and define all terms (including units) in the Beer-Lambert law. 5. What is the purpose of preparing a...
L. Explain why a solution of 0.10 M HNO(ag) conducts more electrical current than does a solution of 0.10 M formic acid, HCOOH. 2. Explain the observed trend in melting points in the hydrogen halides. HI HBr 88.5 °C HF 83.1 "C 14.8° Ethanol has a heat of vaporization of 38.56 kJ/msol and a normal boiling point of 78.4°C. what is the vapor 3. pressure ofethanol at 15 ℃ ? 4. One type of household bleach contains 455% sodium hypochlorite(NaOCl)...
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