At which pH would the following ionization state of methionine be the the most dominant species in solution? (pKa and pl vales are shown below) O H₂N- CH CH₂ CH₂ S CH3 -C Methionine pka, = 2.28 pka₂ = 9.21 pl = 5.74
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- Alizarin yellow R, Ka = 7.9 x 10-1 , is yellow in its protonated form (HX) and red in its ionized form (X). At what pH will alizarin yellow R be a perfect orange color?(a) Given that Kb for ammonia is 1.8 x10-5 and that forhydroxylamine is 1.1 x 10-8, which is the stronger base?(b) Which is the stronger acid, the ammonium ion or thehydroxylammonium ion? (c) Calculate Ka values for NH4+and H3NOH+.At 77°C, 2.00 mol of notrosyl bromide, NOBr, placed in a 1.00-L flask dissociates to the extent of (9.50x10^0)%; that is, for each mole of NOBr before reaction, (1.000-((9.50x10^0)/100)) mol NOBr remains after dissociation. Calculate the value f Kc for the dissociation reaction 2NOBr(g) ↔ 2NO(g) + Br2(g) Express your answer to three significant figures.
- Reaction: CrO42-(aq)+2H+(aq) <--> Cr2O72-(aq)+H2O(l) YELLOW ORANGE If sulfuric acid (H2SO4) is added to this solution, will a color change be observed? If so, how does the addition of sulfuric acid result in a color change? Explain your reasoning by showing the effect of the addition of H2SO4 on the equilibrium for the reaction.Dicarboxylic acids have two dissociation constants, one for the initial dissociation into a monoanion and one for the second dissociation into a dianion. For oxalic acid, HO2C—CO2H, the first ionization constant is pKal = 1.2 and the second ionization constant is pKa2 = 4.2. Why is the second carboxyl group far less acidic than the first?If the pH value of an aqueous solution of trimethylamine [(CH3)3N] is 10.75, what should the molarity of this solution be? (CH3)3N + H2O ↔ (CH3)3NH+ + OH-, Kb = 6,3 × 10-5
- What is the pOH of:(a) a 0.0100 F solution of phtalic acid?(b) a 0.0100 F solution of monopotassium phtalate? (c) a 0.0100 F solution of dipotassium phtalate?if pKa1 = 2.950 and pKa2 = 5.408 for phtalic acidOrder the chloroacetic acid (with R= (H3-x Clx C)for x=0 to 3) series in decreasing value of PH (increasing acid strength)If I have a weak base with a pKb of 6.50 what concentration of [OH-] will be present in a solution at pH of 7? What will the concentration of the conjugate acid be?
- Show the reaction and equilibrium expression for the basic dissociation of trimethylamine. -10 Given that the Ka = 1.58 x 10 for trimethyl ammonium ion, use this to calculate the equilibrium constant for the basic dissociation of trimethyl amine. If the concentration of trimethylamine is 0.10 M, what is the pH of the solution?Hydrazine N2H4can interact with water in two stepsN2H4(aq) + H2O (l) ↔N2H5+(aq) + OH-(aq) Kb1= 8.5 x 10-7N2H5+(aq) + H2O (l)↔N2H62+(aq) + OH-(aq) Kb2= 8.9x 10-16a)What is the concentration of OH-; N2H5+; and N2H62+in a 0.010 M solution of hydrazine?b)What is the pH of the 0.010 M solution of hydrazine?(a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) (ii) Ph Ph Ph 640 THF A 1 B H₂SO4 100 °C 3 OH In analysing both these methods, are there other possible alkene products other than methylenecyclohexane 2?