Sketch and explain the general shapes of graphs showing pH against volume of titrant for titrations involving monoprotic acids and bases.
You can use the pH Curve Sketcher applet below to sketch the pH curves for a variety of acid/base titrations using your mouse. You can then compare your sketch with the true graph by running the applet program.
- decide on the combination of acid and base for the curve that you will sketch.
- a solution of 0.1 mol/L base (aq) is the titrant added from a burette. You can select from a range of bases.
- 25 cm3 of a solution of 0.1 mol/L acid (aq) is the analyte in a flask below the burette. You can select from a range of acids.
- sketch the curve on the graph grid by using your mouse: hold down your left mouse button, drag and release. A line can be drawn as shown below:
A maximum of 50 discrete lines are possible in the sketcher.
- when you have made your sketch and have selected an acid/base combination, press run to compare.
Select an acid and select a base (note: default is strong acid/strong base) and then sketch your graph.