Concept explainers
(a)
Interpretation:
If the given statement is true or false needs to be determined.
The given net ionic equation shows the tiration of NaF versus
Concept introduction:
Titration is to determine the quantitative information of the unknown sample when a known volume and concentration of reactant is utilized. It is usually an acid-base reaction. The unknown solution is the titrantand the known volume of solution is the titrant.
(b)
Interpretation:
If the given statement is true or false needs to be determined.
The given reaction is a reaction between a strong acid and base.
Concept introduction:
Titration is to determine the quantitative information of the unknown sample when a known volume and concentration of reactant is utilized. It is usually an acid-base
(c)
Interpretation:
If the given statement is true or false should be determined.
The solution acts as buffer at equivalnce point.
Concept introduction:
Titration is to determine the quantitative information of the unknown sample when a known volume and concentration of reactant is utilized. It is usually an acid-base reaction. The unknown solution is the titrantand the known volume of solution is the titrant. At the equivalence point, the color of the indicator changes.
(d)
Interpretation:
If the given statement is true or false should be determined.
The pH of the solution is not changed if the solution at half-neutralizartion is diluted with water.
Concept introduction:
Titration is to determine the quantitative information of the unknown sample when a known volume and concentration of reactant is utilized. It is usually an acid-base reaction. The unknown solution is the titrantand the known volume of solution is the titrant. At the equivalence point, the color of the indicator changes.
(e)
Interpretation:
If the given statement is true or false should be determined.
For the given case, phenolphthalein is a good indicator to be used.
Concept introduction:
Titration is to determine the quantitative information of the unknown sample when a known volume and concentration of reactant is utilized. It is usually an acid-base reaction. The unknown solution is the titrantand the known volume of solution is the titrant. At the equivalence point, the color of the indicator changes.
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Chemistry: Principles and Reactions
- Consider the titration of HF (K a=6.7104) with NaOH. What is the pH when a third of the acid has been neutralized?arrow_forwardThe buffer capacity indicates how much OH- or H+ ions a buffer can react with. What is the buffer capacity of the buffers in Problem 10?arrow_forwardA solution is prepared by dissolving 0.350 g of benzoic acid, HC7H5O2, in water to make 100.0 mL of solution. A 30.00-mL sample of the solution is titrated with 0.272 M KOH. Calculate the pH of the solution (a) before titration. (b) halfway to the equivalence point. (c) at the equivalence point.arrow_forward
- The three flasks shown below depict the titration of an aqueous NaOH solution with HCl at different points. One represents the titration prior to the equivalence point, another represents the titration at the equivalence point, and the other represents the titration past the equivalence point. (Sodium ions and solvent water molecules have been omitted for clarity.) a Write the balanced chemical equation for the titration. b Label each of the beakers shown to indicate which point in the titration they represent. c For each solution, indicate whether you expect it to be acidic, basic, or neutral.arrow_forwardPhenol, C6H5OH, is a weak organic acid. Suppose 0.515 g of the compound is dissolved in enough water to make 125 mL of solution. The resulting solution is titrated with 0.123 M NaOH. C6H5OH(aq) + OH(aq) C6H5O(aq) + H2O() (a) What is the pH of the original solution of phenol? (b) What are the concentrations of all of the following ions at the equivalence point: Na+, H3O+, OH, and C6H5O? (c) What is the pH of the solution at the equivalence point?arrow_forwardAcrylic acid is used in the polymer industry in the production of acrylates. Its K, is 5.6 X 10“’. What is the pH of a 0.11 M solution of acrylic acid, CH2CHCOOH?arrow_forward
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- 4) A highly toxic hydrogen cyanide (HCN) is a weak acid. A chemical engineer plans to determine pH of a 50 mL sample of HCN (0.10 M) in a titration process. To this end, she used 0.20 M NaOH as a titrant in varying volumes. Calculate the pH of the solution at the following points: (Ka for HCN=6.2×10-¹0) (a) Before addition of NaOH (initial pH), (b) After 10.00 mL of titrant addition, (c) After 25.00 mL of titrant addition, (d) After 50.00 mL of titrant addition.arrow_forwardA 35.00-mL solution of 0.2500 M HF is titrated with a standardized 0.1762 M solution of NaOH at 25 °C. (a) What is the pH of the HF solution before titrant is added? (b) How many milliliters of titrant are required to reach the equivalence point? mL (c) What is the pH at 0.50 mL before the equivalence point? (d) What is the pH at the equivalence point? (e) What is the pH at 0.50 mL after the equivalence point?arrow_forwardA solution NH 3 that contains 78 mL of 0.043 M ammonia, NH 3, is titrated with 0.083 M HCI. The K₁ of ammonia is 1.8×10-5. (a) What volume of 0.083 M HCI would be added to reach the equivalence point? Give the volume in mL. 40.41 mL (b) At the equivalence point, what is the pH of the solution? (Assume that volumes are additive.) 4.56arrow_forward
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