What is the color of bromthymol blue indicator at pH 7, the midpoint at which yellowand blue are in equal concentration?Select one:O A. greenO B. orangeOC. yellowO D. blueO E. red

When equal amount of blue and yellow color is mixed it forms green. Bromothymol blue is an pH…

Answered: What is the color of bromthymol blue…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter15: Complex Acid/base Systems

Section: Chapter Questions

Problem 15.13QAP

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A solution has a pH of 4.5. What would be the color of the solution if each of the following indicators were added? (See Fig. 14-8.) a. methyl orange b. alizarin c. bromcresol green d. phenolphthalein
Compare the percent ionization of the base in Exercise 22a with the percent ionization of the base in Exercise 22d. Explain any differences.
Explain why an acid-base indicator changes color over a range of pH values rather than at a specific pH.
Explain why barium fluoride dissolves in dilute hydrochloric acid but is insoluble in water.
Compare the percent dissociation of the acid in Exercise 21a with the percent dissociation of the acid in Exercise 21d. Explain the large difference in percent dissociation of the acid.
Write the Lewis structures of the reactants and product of each of the following equations, and identify the Lewis acid and the Lewis base in each: (a) CS2+SHHCS3 (b) BF3+FBF4 (c) I+SnI2SnI3 (d) Al(OH)3+OHAl(OH)4 (e) F+SO3SFO3
. For each hydrogen or hydroxide ion concentration listed. calculate the concentration of the complementary ion and the pH and pOH of the solution. a. [H+]=5.72104M b. [OH-]=8.91105Mc. [H+]=2.871012Md. [OH-]=7.22108M
For oxyacids, how does acid strength depend on a. the strength of the bond to the acidic hydrogen atom? b. the electronegativity of the element bonded to the oxygen atom that bears the acidic hydrogen? c. the number of oxygen atoms? How does the strength of a conjugate base depend on these factors? What type of solution forms when a nonmetal oxide dissolves in water? Give an example of such an oxide. What type of solution forms when a metal oxide dissolves in water? Give an example of such an oxide.
Phthalic acid, H2C8H4O4, is a diprotic acid used in the synthesis of phenolphthalein indicator. Ka1 = 1.2 103, and Ka2 = 3.9 106. a Calculate the hydronium-ion concentration of a 0.015 M solution. b What is the concentration of the C8H4O42 ion in the solution?
A solution is made by dissolving 15.0 g sodium hydroxide in approximately 450 mL water. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to bring the volume to 500.0 mL of solution. (a) Calculate the pH and pOH in the final solution. (b) Why would we wait for it to return to room temperature? (c) If the mass of the water used to initially dissolve the sodium hydroxide were exactly 450 g and the temperature of the water increased by 8.865 C, how much heat was given off by the dissolution of 15.0 g of solute? Assume the specific heat of the solution is 4.184 J/g. K. What is the molar heat change for the dissolution of sodium hydroxide (known as the enthalpy of solution, Hsol)?
Blood is buffered mainly by the HCO3 H2CO3 buffer system. The normal pH of blood is 7.40. (a) Calculate the [ H2CO3 ]/[ HCO3 ] ratio. (b) What does the pH become if 15% of the HCO3 ions are converted toH2CO3? (c) What does the pH become if 15% of the H2CO3 molecules converted to HCO3 ions?
Each of the following statements concerns a 0.010 M solution of a weak acid, HA. Briefly describe why each statement is either true or false. a [HA] is approximately equal to 0.010 M. b [HA] is much greater than [A]. c [OH] is approximately equal to [H3O+]. d The pH is 2. e The H3O concentration is 0.010 M. f [H3O+] is approximately equal to [A].

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What is the color of bromthymol blue indicator at pH 7, the midpoint at which yellow and blue are in equal concentration? Select one: O A. green O B. orange OC. yellow O D. blue O E. red