Concept explainers
(a)
Interpretation:
An equation for the response of a
Concept Introduction:
Buffer:
A buffer is an aqueous solution containing substances that prevent major changes in the value of the pH when small amounts of acid or base are added to it.
In other words, a buffer system is composed of a weak acid and its conjugate base.
Buffers contain two active chemical species:
- a substance to react with and remove added base.
- a substance to react with and remove added acid.
Buffer action:
Buffering actions are the reactions that take place in the buffer system with the addition of a small amount of acid or base.
(b)
Interpretation:
An equation for the response of a
Concept Introduction:
Buffer:
A buffer is an aqueous solution containing substances that prevent major changes in the value of the pH when small amounts of acid or base are added to it.
In other words, a buffer system is composed of a weak acid and its conjugate base.
Buffers contain two active chemical species:
- a substance to react with and remove added base.
- a substance to react with and remove added acid.
Buffer action:
Buffering actions are the reactions that take place in the buffer system with the addition of a small amount of acid or base.
(c)
Interpretation:
An equation for the response of a
Concept Introduction:
Buffer:
A buffer is an aqueous solution containing substances that prevent major changes in the value of the pH when small amounts of acid or base are added to it.
In other words, a buffer system is composed of a weak acid and its conjugate base.
Buffers contain two active chemical species:
- a substance to react with and remove added base.
- a substance to react with and remove added acid.
Buffer action:
Buffering actions are the reactions that take place in the buffer system with the addition of a small amount of acid or base.
(d)
Interpretation:
An equation for the response of a
Concept Introduction:
Buffer:
A buffer is an aqueous solution containing substances that prevent major changes in the value of the pH when small amounts of acid or base are added to it.
In other words, a buffer system is composed of a weak acid and its conjugate base.
Buffers contain two active chemical species:
- a substance to react with and remove added base.
- a substance to react with and remove added acid.
Buffer action:
Buffering actions are the reactions that take place in the buffer system with the addition of a small amount of acid or base.
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EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- Methyl orange, HMO, is a common acid-base indicator. In solution it ionizes according to the equation: HMOaqH+aq+MO-aqredyellow If methyl orange is added to distilled water, the solution turns yellow. If 1 drop or two of 6 M HCl is added to the yellow solution, it turns red. If to that solution one adds a few drops of 6 M NaOH, the color reverts to yellow. a. Why does adding 6 M HCl to the yellow solution of methyl orange tend to cause the color to change to red? Note that in solution HCl exists as H+ and Cl- ions. b. Why does adding 6 M NaOH to the red solution tend to make it turn back to yellow? Note that in solution NaOH exists as Na+ and OH- ions. How does increasing OH- shift Reaction 3 in the discussion section? How would the resulting change in H+ affect the dissociation reaction of HMO?arrow_forwardThe pH of 0.10 M CH3NH2 (methylamine) is 11.8. When the chloride salt of methylamine, CH3NH3Cl, is added to this solution, does the pH increase or decrease? Explain, using Le Chteliers principle and the common-ion effect.arrow_forwardA solution made up of 1.0 M NH3 and 0.50 M (NH4)2SO4 has a pH of 9.26. a Write the net ionic equation that represents the reaction of this solution with a strong acid. b Write the net ionic equation that represents the reaction of this solution with a strong base. c To 100. mL of this solution, 10.0 mL of 1.00 M HCl is added. How many moles of NH3 and NH4+ are present in the reaction system before and after the addition of the HCl? What is the pH of the resulting solution? d Why did the pH change only slightly upon the addition of HCl?arrow_forward
- . A buffered solution is prepared containing acetic acid, HC2H3O2, and sodium acetate, NaC2H3O2, both at 0.5 M. Write a chemical equation showing how this buffered solution would resist a decrease in its pH if a few drops of aqueous strong acid HCI solution were added to it. Write a chemical equation showing how this buffered solution would resist an increase in its pH if a few drops of aqueous strong base NaOH solution were added to it.arrow_forwardHow many moles of sodium acetate must be added to 2.0 L of 0.10 M acetic acid to give a solution that has a pH equal to 4.90? Ignore the volume change due to the addition of sodium acetate.arrow_forwardConsider all acid-base indicators discussed in this chapter. Which of these indicators would be suitable for the titration of each of these? (a) NaOH with HClO4 (b) acetic acid with KOH (c) NH3 solution with HBr (d) KOH with HNO3 Explain your choices.arrow_forward
- Sodium benzoate, NaC7H5O2, is used as a preservative in foods. Consider a 50.0-mL sample of 0.250 M NaC7H5O2 being titrated by 0.200 M HBr. Calculate the pH of the solution: a when no HBr has been added; b after the addition of 50.0 mL of the HBr solution; c at the equivalence point; d after the addition of 75.00 mL of the HBr solution. The Kb value for the benzoate ion is 1.6 1010.arrow_forwardWhat volume of 0.120 M NaOH must be added to 100. mL of 0.100 M NaHC2O4 to reach a pH of 4.70?arrow_forwardAn important component of blood is the buffer combination of bicarbonate ion and carbonic acid. Consider blood with a pH of 7.42. a What is the ratio of [H2CO3] to [HCO3]? b What does the pH become if 15% of the bicarbonate ions are converted to carbonic acid? c What does the pH become if 25% of the carbonic acid molecules are converted to bicarbonate ions?arrow_forward
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