42 9.7 Neutralization and Titration Practice
Key Concepts and Summary
The stoichiometry of chemical reactions may serve as the basis for quantitative chemical analysis methods. Titrations involve measuring the volume of a titrant solution required to completely react with a sample solution. This volume is then used to calculate the concentration of analyte in the sample using the stoichiometry of the titration reaction.
Chemistry End of Chapter Exercises
- What volume of 0.0105-M HBr solution is required to titrate 125 mL of a 0.0100-M Ca(OH)2 solution?
[latex]\text{Ca(OH)}_2(aq) + 2\text{HBr}(aq) \longrightarrow \text{CaBr}_2(aq) + 2\text{H}_2 \text{O}(l)[/latex] - Titration of a 20.0-mL sample of acid rain required 1.7 mL of 0.0811 M NaOH to reach the end point. If we assume that the acidity of the rain is due to the presence of sulfuric acid, what was the concentration of sulfuric acid in this sample of rain?
- What is the concentration of NaCl in a solution if titration of 15.00 mL of the solution with 0.2503 M AgNO3 requires 20.22 mL of the AgNO3 solution to reach the end point?
[latex]\text{AgNO}_3(aq) + \text{NaCl}(aq) \longrightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)[/latex] - In a common medical laboratory determination of the concentration of free chloride ion in blood serum, a serum sample is titrated with a Hg(NO3)2 solution.
[latex]2\text{Cl}^{-}(aq) + \text{Hg(NO}_3)_2(aq) \longrightarrow {2\text{NO}_3}^{-}(aq) + \text{HgCl}_2(s)[/latex]What is the Cl− concentration in a 0.25-mL sample of normal serum that requires 1.46 mL of 8.25 × 10−4M Hg(NO3)2(aq) to reach the end point?
- Potatoes can be peeled commercially by soaking them in a 3-M to 6-M solution of sodium hydroxide, then removing the loosened skins by spraying them with water. Does a sodium hydroxide solution have a suitable concentration if titration of 12.00 mL of the solution requires 30.6 mL of 1.65 M HCl to reach the end point?
- What volume of 0.600 M HCl is required to react completely with 2.50 g of sodium hydrogen carbonate?
[latex]\text{NaHCO}_3(aq) + \text{HCl}(aq) \longrightarrow \text{NaCl}(aq) + \text{CO}_2(g) + \text{H}_2 \text{O}(l)[/latex] - What volume of 0.08892 M HNO3 is required to react completely with 0.2352 g of potassium hydrogen phosphate?
[latex]2\text{HNO}_3(aq) + \text{K}_2 \text{HPO}_4(aq) \longrightarrow \text{H}_2 \text{PO}_4(aq) + 2\text{KNO}_3(aq)[/latex] - What volume of a 0.3300-M solution of sodium hydroxide would be required to titrate 15.00 mL of 0.1500 M oxalic acid?
[latex]\text{C}_2 \text{O}_4 \text{H}_2(aq) + 2\text{NaOH}(aq) \longrightarrow \text{Na}_2 \text{C}_2 \text{O}_4(aq) + 2\text{H}_2 \text{O}(l)[/latex] - What volume of a 0.00945-M solution of potassium hydroxide would be required to titrate 50.00 mL of a sample of acid rain with a H2SO4 concentration of 1.23 × 10−4M.
[latex]\text{H}_2 \text{SO}_4(aq) + 2\text{KOH}(aq) \longrightarrow \text{K}_2\text{SO}_4(aq) + 2\text{H}_2 \text{O}(l)[/latex] - A sample of solid calcium hy