DP Chemistry Questionbank

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• 18M.2.hl.TZ2.2d.iv: Predict whether the pH of an aqueous solution of ammonium chloride will be greater than, equal to...
• 18M.2.hl.TZ2.2d.i: The graph represents the titration of 25.00 cm3 of 0.100 mol dm−3 aqueous ethanoic acid with...
• 18M.2.hl.TZ1.5e: Explain, using appropriate equations, how a suitably concentrated solution formed by the partial...
• 18M.1.hl.TZ1.27: Which combination of acid and base is most likely to have a pH of 8.5 at the equivalence point in...
• 17N.1.hl.TZ0.27: Which indicator is appropriate for the acid-base titration shown below? A. Thymol blue (pKa =...
• 17N.1.hl.TZ0.26: Which of the following will form a buffer solution if combined in appropriate molar ratios? A....
• 17M.2.hl.TZ2.8b.vi: Deduce the pKa for this acid.
• 17M.2.hl.TZ2.8b.iv: The following curve was obtained using a pH probe. State, giving a reason, the strength of the...
• 17M.2.hl.TZ1.5d.ii: Suggest a suitable indicator for the titration of hydrazine solution with dilute sulfuric acid...
• 17M.1.hl.TZ1.27: A buffer is produced by mixing 20.0 cm3 of 0.10 mol dm−3 ethanoic acid, CH3COOH(aq), with 0.10...
• 16N.2.hl.TZ0.7b: (i) Sketch a graph of pH against volume of a strong base added to a weak acid showing how you...
• 16N.1.hl.TZ0.29: Which salt solution has the highest pH? A. NH4Cl B. Ca(NO3)2 C. Na2CO3 D. K2SO4
• 16N.1.hl.TZ0.28: Which mixture is a buffer solution? A.  25 cm3 of 0.10 mol dm-3 NH3 (aq) and 50 cm3 of 0.10 mol...
• 16M.1.hl.TZ0.29: Which titration curve would...
• 15M.1.hl.TZ1.29: Which mixture will form a buffer in aqueous solution? A.    ...
• 15M.1.hl.TZ2.29: For which titration can the end point not be determined accurately by using an acid-base...
• 15M.2.hl.TZ1.8c.i: Determine the pH at the equivalence point of the titration and the \({\text{p}}{K_{\text{a}}}\)...
• 15M.2.hl.TZ1.8c.ii: Identify, using table 16 of the data booklet, a suitable indicator to show the end-point of this...
• 15M.2.hl.TZ1.8c.iii: Describe how an indicator, that is a weak acid, works. Use Le Chatelier’s principle in your answer.
• 15M.2.hl.TZ2.4a: Define the term buffer solution.
• 15M.2.hl.TZ2.4b: Explain, using appropriate equations, how this solution acts as a buffer solution.
• 15M.2.hl.TZ2.7g: (i)     Sketch the pH titration curve obtained when \({\text{50.0 c}}{{\text{m}}^{\text{3}}}\) of...
• 14M.1.hl.TZ1.28: A weak acid is titrated with a strong base. Which statement is true for the titration...
• 14M.1.hl.TZ2.28: Which statements about an acid–base indicator are correct? I.     It can be a weak acid. II.   ...
• 14M.1.hl.TZ2.27: Which compounds can be mixed together as aqueous solutions of equal volume and concentration to...
• 14M.1.hl.TZ1.27: Which mixture of solutions can be used to prepare a buffer solution? A.    ...
• 14M.1.hl.TZ1.29: Methyl orange is an indicator which changes its colour from red to yellow in a pH range of 3.2 –...
• 14M.1.hl.TZ2.30: Which graph would be obtained by adding...
• 14M.2.hl.TZ1.7c.vi: Identify a suitable indicator for this titration, using Table 16 of the Data Booklet.
• 14M.2.hl.TZ1.7c.ii: A buffer solution is made using \({\text{25.0 c}}{{\text{m}}^{\text{3}}}\) of...
• 14M.2.hl.TZ2.5b.vi: Describe, using HIn to represent the indicator in its acid form, why an indicator changes colour...
• 14N.1.hl.TZ0.29: The acid–base indicator phenol red, HIn, changes colour from yellow to red over a pH range of...
• 14N.2.hl.TZ0.8f: (i)     Most indicators are weak acids. Describe qualitatively how indicators...
• 13N.1.hl.TZ0.29: Which pair of compounds could be used to make a buffer solution (assuming appropriate molar...
• 13N.2.hl.TZ0.7d.ii: Identify one indicator that could be used when titrating aqueous sodium hydroxide with both a...
• 13N.2.hl.TZ0.7e.i: Explain how the \({\text{p}}{K_{\text{a}}}\) could be determined from a graph of pH against the...
• 13M.1.hl.TZ1.29: The colours of three indicators are shown in the table below. Equal volumes of these three...
• 13M.2.hl.TZ1.1f.i: State what is meant by a buffer solution.
• 13M.2.hl.TZ2.6c.i: State whether the following mixtures, in the appropriate molar ratios, can be classified as...
• 13M.2.hl.TZ2.6d.ii: Using Table 16 of the Data Booklet, identify the most appropriate indicator for the titration of...
• 12N.1.hl.TZ0.29: During a titration, \({\text{0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}\) sodium hydroxide is added...
• 12N.2.hl.TZ0.3a: Describe the composition of an acidic buffer solution.
• 10N.1.hl.TZ0.28: Equal volumes and concentrations of hydrochloric acid and ethanoic acid are titrated with sodium...
• 10N.1.hl.TZ0.29: Bromophenol blue changes from yellow to blue over the pH range of 3.0 to 4.6. Which statement is...
• 10N.2.hl.TZ0.6d: (i)     Calculate the volume of the sodium hydroxide solution required to react exactly with a...
• 09N.1.hl.TZ0.28: Which indicator would be the most appropriate for titrating aqueous ethylamine,...
• 09N.2.hl.TZ0.8a.i: Determine the pH at the equivalence point.
• 09N.2.hl.TZ0.8a.iv: Estimate, using data from the graph, the dissociation constant, \({K_{\text{a}}}\), of the weak...
• 09N.2.hl.TZ0.8a.ii: Explain, using an equation, why the equivalence point is not at \({\text{pH}} = 7\).
• 09N.2.hl.TZ0.8a.v: Suggest an appropriate indicator for this titration.
• 09N.2.hl.TZ0.8c.i: Explain what is meant by the term buffer solution.
• 10M.2.hl.TZ2.7c: (i)     Explain why the pH of the ammonia solution is less than 13. (ii)     Estimate the pH at...
• 09M.1.hl.TZ1.28: Which mixtures could act as buffers? I.     NaOH(aq) and HCl(aq) II.     NaOH(aq) and...
• 09M.2.hl.TZ1.2b: The graph below shows a computer simulation of a titration of...
• 11M.2.hl.TZ1.8a.iii: The graph below indicates the pH change during the titration of...
• 11M.2.hl.TZ1.8a.v: Sketch a graph, similar to the graph on the previous page, to indicate the change in pH during a...
• 11M.1.hl.TZ1.29: Which compounds can be mixed together as solutions of equal volume and concentration to form a...
• 11M.2.hl.TZ1.8a.iv: Explain how the graph could be used to determine the \({\text{p}}{K_{\text{a}}}\) of ethanoic...
• 11M.1.hl.TZ2.29: The graph below shows the titration curve of \({\text{25 c}}{{\text{m}}^{\text{3}}}\) of...
• 11M.2.hl.TZ2.5a.v: \({\text{25.0 c}}{{\text{m}}^{\text{3}}}\) of...
• 11M.2.hl.TZ2.5a.vi: State what is meant by a buffer solution and explain how the solution in (v), which contains...
• 12M.1.hl.TZ2.26: Which mixtures are buffer solutions? I.     \({\text{KHS}}{{\text{O}}_{\text{4}}}{\text{(aq)}}\)...
• 12M.1.hl.TZ2.27: Which titration curve is produced by the titration of \({\text{25 c}}{{\text{m}}^{\text{3}}}\) of...
• 12M.2.hl.TZ2.8d: A solution of ammonia has a concentration of...
• 12M.2.hl.TZ2.8f: (i)     Identify the property of bromocresol green that makes it suitable to use as an acid–base...