Consider the following buffer systems: H,CO3 HCO, + H+ pka = 6.4 %3D H2PO, + НРО + нt pКа 3D 7.2 HPO Describe the relative amounts of the acid and conjugate base for each system at a pH of 6.89 H2CO3 HCO, H,PO, НРО

Q: What is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 (MM 136.1 g/mol) and 20.41…

A: Given : Mass of KH2PO4 = 17.42 g Mass of K2HPO4 = 20.41 g And Ka of KH2PO4 = 6.2 X 10-8  Molar mass…

Q: Given aqueous solutions of 0.1 M weak acetic acid (CH3COOH, pKa=4.72) and 0.1 M sodium acetate…

A: Consider the volume of acetic acid in the final solution be x L and the volume of sodium acetate in…

Q: Calculate the pH after the addition o 50 ml of 0.2 M of HCI to 100 ml of 0. M of sulfite (SO3^2-). (…

A: Number of moles of sulphite ions in the solution = 0.01 mol Number of moles of HCl added to the…

Q: The pk, for the acid dissociation reaction of bicarbonate is 10.33. HCO3 (aq) + H2O(1) 2 CO32-(aq) +…

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Q: 3) i) A 25.0mL sample of a 30.0% HF solution has a density of 1.101g/mL. The sample is diluted to a…

A: (i) Given,     Initial volume of the solution is 25.0 mL.    Final volume of the solution is 500 mL.…

Q: Given the following table of K, values, what would be the best conjugate acid to choose to make a…

A: The solution is given below -

Q: A certain diprotic acid has a Ka1= 5.87e-4 and a Ka2= 5.55e-9. Calculate the pH of 737mL of a 0.259…

A: The pH of a solution measures the acidity or basicity of a solution. If its value is greater than 7,…

Q: suppose we drop (10ml of 1 M) of strong base (NaOH) into our buffer. Calculate the PH value for this…

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Q: Salts containing the phosphate ion are added to municipalwater supplies to prevent the corrosion of…

A: GIVEN: pKa1 = 7.5 x 10 - 3 pKa2 = 6.2 x 10 - 8  pKa3 = 4.2 x 10 - 13 Concentration of Na3PO4= 1 x 10…

Q: 2.1 The correct indicator was added to 25.00 mL of a 0.1345 M solution of propanoic acid…

A: Propanoic acid is titrated with sodium hydroxide.

Q: Calculate the pH of a solution made by combining 0.750 L of 0.523 M valeric acid (CH3(CH2)3COOH)…

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Q: 3.85     For each solution, calculate the dissociation constant of the acid. Comment on the…

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Q: Calculate the pH of a mixture containing 0.23 M HONH2 and 0.44 M HONH3Cl. (Kb = 1.1 × 10–8) What…

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Q: Calculate the pH of a base buffer solution composed of 0.20 M NH3 and 0.15 M NH4Cl after the…

A: The formula to calculate the pH of the solution is, pOH+pH=14pH=14-pOH Given, The concentration of…

Q: Calculate the pH of a buffer solution that is 0.050 M in benzoic acid (HC7H5O2) and 0.150 M in…

A: Given: [C6H5COOH] = 0.050M            [C6H5COONa] = 0.150M                  Ka for benzoic acid =…

Q: The pKa of lactic acid is 3.86. You have a mixture of lactic acid and sodium lactate, where the…

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Q: The pH of a 0.2L HNO2-NO2 buffer solution was determined to be 6.23. The solution was mixed with…

A: Buffer solution A buffer solution is an aqueous mixture of a weak acid and either its conjugate base…

Q: Ethylamine (C2H5NH2) has a Kb value of 4.5x10–4. Calculate the pH of a buffer solution that is…

A:

Q: ou have been asked to prepare 250.0 mL of a buffer solution with a pH of 8.88 at room temperature.…

A: Given: Volume of buffer = 250.0 mL = 0.250 L                               (Since 1 L = 1000 mL) pH…

Q: 1. Write a chemical equation for the dissociation of the hypochlorite ion, ClO-1, in water to make a…

A: Hello. Since the question contains multiple parts, the first part is solved. In case the solution…

Q: 2. The active component of aspirin is acetylsalicylic acid, HC,H,0., which has a K. of 3.0 x 10-4…

A: 2) Given: Ka of HC9C7O4 = 2.0 × 10-4  a) Given: Mass of HC9C7O4 = 0.500 g. And volume of solution =…

Q: Q7. Given the following Ka values for the weak acids and bases: CH;COOH/CH3CO0 HCO3/CO,2- H2PO4…

A: To find the pair that will be appropriate as buffer of given range we use the buffer range of each…

Q: Calculate the pH of a 1.07 M solution of a weak acid, AH, for instance CH3COOH, and 0.62 M of a…

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Q: Calculate the pH of a buffer prepared by mixing 0.38 M C5H5N with 0.87M C5H5NH+ given that the Kb…

A: Buffer is the solution of mixture of weak acid/weak base with its salt of strong base/strong acid

Q: Calculate the pOH of 103.16 mL of a buffer initially consisting of 0.1752 M H2NCH2COOH and 0.1573 M…

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Q: Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is…

A: By using the Henderson-Hasselbalch's equation, we can calculate the pH of the buffer, pH = pKa +…

Q: The desired pH is 6.4 in creating a buffer system/buffer solution of about 50-60mL. Therefore, a…

A: A buffer solution is made of a weak acid and the salt of that weak acid. The pH of the buffer does…

Q: In the following equation HNO2 (aq) + H2O (l) ↔ H3O+ (aq) + NO2-(aq), 0.37 M of nitrous acid was…

A: Given data,Molarity of HNO2=0.37MKa for HNO2=4.5×10-4M

Q: Which solution below would have the greatest buffering capacity? The solution was prepared from a…

A: To find which buffer have greatest buffering capacity first we have to know about the Buffer…

Q: Calculate the % relative error in hydronium ion concentration by using concentrations instead of…

A: Given Ka, Acetic Acid → 1.75×10-5 Ammonium ions → 5.70×10-10 Chloroacetic Acid → 1.36×10-3…

Q: Calculate the pH of a 1.00L solution containing 0.52M sodium acetate and 0.48M acetic acid after the…

A: Given that, concentration of CH3COONa in 1 L solution = 0.52 M = 0.52 mole L-1 and concentration of…

Q: An aqueous buffer solution of volume 100 cm3 consists of 0.20 M CH3COOH and 0.20 M NaCH3CO2.…

A: a) Calculation of pH of the solution: Thus pH of the solution in 3 significant figures is 4.75

Q: Calculate the pH of a buffer solution prepared by mixing 25 mL of 1.0 M lactic acid and 75 mL of 1.0…

A: It is an acidic buffer.

Q: Select the equation which correctly describes a buffer solution formed from a weak acid and its…

A: The equations given are,

Q: An analytical chemist is titrating 122.4 mL of a 0.2000M solution of propylamine (C,H,NH,) with a…

A:

Q: Consider a buffer solution that contains 0.40 M C6H4(CO2H)2 and 0.25 M C6H4(CO2H)(CO2K).…

A: (A) Change in pH = 2.746-1.995 = 0.751

Q: what is the (HSO4)-, (SO4)2- and ph of a buffer solution which is composed of 50mL of 0.25M NaHSO4…

A: We have to calculate the pH of the buffer solution

Q: The ion product constant of pure water at 40 °C with pH value of 6.77 is: O a 2.88 x 10-14 O b. 6.92…

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Q: Calculate the pH for the complete titration of 100.0 mL of 0.122 M hydrazine, H2NNH2, with 0.200 M…

A: In this question, first we will calculate the concentration of salt, which is forming after the…

Q: Calculate the isoionic pH of 6.022 x 1021 molecules of thereonine in 500 mL of solution. (For…

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Q: You have 500. mL of a solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodium acetate…

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Q: A group of students perform a titration experiment. The buret tube is filled to the 0.00ml line with…

A: To solve this question, first find equivalence point volume using dilution law. Then calculate moles…

Q: Arsenic acid is a triprotic acid with the pKa values pK₁1 = 2.240, pKa2 = 6.960, and pK₁3 = 11.500.…

A: Here we have to determine the mass of NaH2AsO4 and NaH2AsO4 required to prepare 1L of buffer…

Q: 2.1 The correct indicator was added to 25.00 mL of a 0.1340 M solution of pentanoic acid…

A: 2.1.1. ) First we would write complete chemical equation , then we would write complete ionic…

Q: 6. How many grams of NazHPO, *2 H20 (177.99 g/mol) should be added to 500 mL of 0.5 M H3PO4 to give…

A: H3PO4 and Na2HPO4 will make buffer solution of the combination of weak acid and weak base.

Q: Phosphoric acid is a triprotic acid with the pKa values pKa1=2.148, pKa2=7.198, and pKa3=12.375.…

A: Phosphate buffer is having high buffering capacity and it is made according to the pH requirement.…

Q: 25.  A buffer is prepared using acetic acid, CH3COOH, (a weak acid, pKa = 4.75) and sodium acetate,…

A: Buffer solution is the solution which has tendency to maintain constant pH upon addition of small…

Q: Calculate the ratio of conjugate base to weak acid, [A−]/[HA], needed to make a buffer at pH = 5.00…

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Q: calculate the pH of a solution prepared by adding 20.0 mL of 0.500M CH3COOH with 21.43 mL of 0.500 M…

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.