A) Phenol Red is a weakly acidic dye which is yellow in the HA form and red in the A form. What concentration of Phenol Red is required to obtain an absorbance of 0.50 at 550 nm at pH 7.8? Note: ε550 of A = 2.5 x 104 M-1 cm-1; ε550 of HA = 0; pKa = 7.8. B) What would the absorbance of the solution in part (a) be if the pH was 8.8?

Q: Is carvacrol more acidic or less acidic than phenol? Explain your answer.

A: Higher will be the stability of anion ( after removal of proton ) higher will be acidity

Q: 22). What is the major product of the following reactions? (A) (B) Br 1) NaCN 2) CH3MgBr 3) H30*/H₂O…

A: Grignard reagents are highly reactive organomagnesium halides formed by the reaction of magnesium…

Q: At pH 3.0, what percentage (in %) of lactic acid is in its deprotonated form? Hint: The pKa of…

A: Given, pH of lactic acid is 3.0. Its pKa value is 3.86. What percentage of lactic acid is in its…

Q: The weakest of the acids below is and its pK is . The strongest of the acids below is |and its pK is…

A: Pk value  - which  measure the  strength  of acid in logarithmic scale.

Q: (a) Rank the following compounds in order of increasing acidity. (b) Which compound forms the…

A: The acidic strength of the organic acids is determined by the stability of the corresponding…

Q: Phthalic acid and isophthalic acid have protons on two carboxy groupsthat can be removed with base.…

A: Normally acidic strength of a compound can be determined by the amount of stability of its conjugate…

Q: Arrange the following organic molecules in order of increasing acidity, starting with the least…

A: Acid are sour substances.  Acids contain protons and they can donate their protons. Acids have their…

Q: Rank the following ammonium ions in order of increasing pKa.

A: pKa is defined as the negative logarithm of Ka. More is the acidity of the compound, more is it’s…

Q: explain in great detail why the pKa values are what they are and compare them among the three…

A: Basicity is defined as electron donation ability of  a molecule. If it is able to donate electrons…

Q: The pka of phenol (C6H5OH) is 10.0. When a nitro group (NO2) is attached to the ring, the pK,…

A: pKa and acidity are inversely related. The compounds with higher pKa values are least acidity in…

Q: 4. (Chapter 15 - 472) An aromatic compound C3H;Br has the following H NMR spectrum and a peak at 820…

A: For the para-disubstituted benzene, the C-H wag comes between 860 and 790 cm-1. Thus, 820 cm-1…

Q: Draw the structure of the following three isomeric amides with chemical formula C,HNO. Amide #1:…

A:

Q: Н H OH H Н О Br Н Н О ОН CL н н CI О ОН Н Н. Н 'F ОН OH

A:

Q: Show the reaction and equilibrium expression for the basic dissociation of trimethylamine. Given…

A: The pH is scale for determining the acidity of a solution. If the pH of a solution is below 7 then…

Q: Determine the hybridization around the N atom in each amine, andexplain why cyclohexanamine is 106…

A: Hybridization is a hypothetical concept which involves mixing of two or more pure orbitals. When…

Q: Compounds like amphetamine that contain nitrogen atoms are protonated by the HCl in the gastric…

A: When amphetamine is treated with HCI in the gastric juices of the stomach, nitrogen atom gets…

Q: The table shows the base ionisation constant, Kb, for several selected compounds. (a) Compound…

A: Higher the value of Kb , higher will be the strength of base. Stronger base will have weak conjugate…

Q: CDCI3 80 75 70 65 60 55 50 45 40 35 30 25 15 10

A: The question is based on the concept of Spectroscopy. we have to assign chemical shift value to…

Q: 8) Which compound is more acidic: 1) Aminomethan or aniline? 2) Ethanol or phenol? Draw the…

A: Acidity is the tendency of compound to give proton. Higher the tendency, higher will be the acidity.…

Q: The pKa for 2-hydroxybenzoic acid (i.e. salicylic acid, used in pain relief and a precursor for…

A: The chemical structures of 2-hydroxybenzoic acid (salicylic acid) and 3-hydroxybenzoic acid, along…

Q: Which compound would be more basic or weaker, a compound with a pka of -3.5 or a compound with a…

A: Which compound would be more basic or weaker, a compound with a pka of -3.5 or a compound with a pka…

Q: phosphorus reagent is required for this n? PPh3 (B) (C) PPh3 H PPh3 (D) PPh3

A: Wittig reaction is the formation of olefins from the aldehyde and ketone when treated with…

Q: Carboxylic acids, such as enanthic acid (heptanoic acid. C7H14O₂), often give a strong fragment ion…

A: The carboxylic acid especially the alphatic carboxylic acid shows observable molecular ion peaks as…

Q: b) If you treat either A or B with the same reagents, you obtain the same major product. Explain why…

A: Enolate reacts with carbonyl compound to produce a product with a new C-C bond.

Q: Using pKa Values to Determine Relative Acidity and Basicity Rank the following compounds in order of…

A: pKa of acid : Ka is called the acid dissociation constant. If any compound easily gives H+ than the…

Q: ）Rank the following compounds in order of increasing pKa values, and explain your choices in detail.

A: Carboxylic acids are stronger acids than ketones. In carboxylic acids, the hydrogen atom attached to…

Q: Identify the structures of D and E, isomers of molecular formula C6H12O2, from their IR and 1H NMR…

A:

Q: 5. Which of the following equations shows that isoquinoline, CoH;N, behaves as a Bronsted-Lowry base…

A: According to bronsted -Lowry concept base are those species which accept proton and after accepting…

Q: 3. Based on the pH results obtained in this experiment, complete the following equation for the…

A: Step 1:

Q: Ciprofloxacin is a member of the fluoroquinolone class of antibiotics.(a) Which of its rings are…

A:

Q: When the phenol red dye has turned yellow in solution, would phenol red be in the predominate…

A: Phenol red is a pH indicator that is used in cell biology and fermentation processes.

Q: 4-Methylphenol is more acidic than ethanol (pKa 10.36 vs 16.0) , even though both contain an OH…

A: The organic compounds containing -OH group are slightly acidic in nature. The acidic properties of…

Q: Hypoglycin A, an amino acid derivative found in unripened lychee, is anacutely toxic compound that…

A: Given compound,

Q: Which of the follwoing compounds is responsible for the mass sepctrum and why? (a) octanol,…

A: Mass spectrometry is an analytical tool useful for measuring the mass-to-charge ratio (m/z) of one…

Q: Write the equilibrium-constant expressions and obtainnumerical values for each constant in. (a) the…

A:

Q: Propose a structure for an amine with molecular formula C6H7N by interpreting the given 'H and 13C…

A: The possible structure of C6H7N is given below

Q: Give the compounds with the following spectral data. a. C8H8O3 IR: 3500 cm' to 2500 cm, 1688 cm!…

A: The inspecting of an unknown compound by its molecular formula is done by calculating the index of…

Q: 16.55 Working backwards, deduce the starting material that led to the indicated product through the…

A: We have find out the A and B starting material with detailed mechanism

Q: 4. The pk, of vanillin is about 9, which is much more acidic than a normal alcohol. Draw a reaction…

A: We have to draw a reaction scheme of the reaction between vanillin and NaOH. We also have to draw…

Q: A compound A of mass 114 has the following elemental analysis: C = 63.14%, H=8.83%. The IR, 1H NMR…

A: Proton-NMR spectroscopy is mainly used for the identification of complete structure of the orgnanic…