Concept explainers
Interpretation:
The equilibrium concentrations of
Concept introduction:
Acid–base titration is a technique to analyze the unknown concentration of an acid or base through the known concentration of an acid and the base.
The equivalence point is the point in the acid–base titration in a chemical reaction where the number of moles of the titrant and the unknown concentration of the analyte are equal and it is used to identify the unknown concentration of the analyte.
If an anion reacts with water, it is called anionic hydrolysis. If a cation reacts with water, it is called cationic hydrolysis.
Answer to Problem 32QP
Solution: The final concentration of
Explanation of Solution
Given information: The concentration of
The volume of
The concentration of
The volume of
Moles of
Substitute
Moles of
Substitute,
Summarize the moles at equilibrium, which are as follows.
The resulting solution is not a buffer solution.
The volume of the resulting solution is calculated as follows:
Concentration of
Substitute
Concentration of
Substitute
Concentration of
Substitute
Concentration of
Substitute
Consider
The conjugate base undergoes anionic hydrolysis.
Summarize the concentration at equilibrium as follows:
The equilibrium expression for a reaction is written as follows:
Here,
Substitute
The value of x is very small as compared to
Solving further,
The final concentrations are as follows:
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Chapter 17 Solutions
CHEMISTRY- BUNDLE CONNECT PLUS ACCESS
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- 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_forwardSodium 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_forward
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