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Example: Calculate pH of buffer solution: (other examples:make pH buffer, adjust pH of buffer)
This example is to calculate pH value of sodium acetate/acetic acid buffer at different conditions.
 In main menu Click Popular services>Biotech/chemistry, then click pH buffer calculator.  Then give temperature of the buffer.
Figure 1. shows how to set up pH calculation condition.  At this step, user is to choose initial state as Buffer solution (default), add no chemical in add chemical dropdown list (default), and give pKa value=4.76 of the buffer. Then click Next step button to calculation page

Figure 1. Set up pH calculation.

At calculation page, give either concentration ratio of  final base vs final acid, or final concentartion of acid and base, then click calculate button to see the pH value determined. Figure 2 shows calculated result if only final concentration ratio is given, and input final concentrations.

Figure 2. Calculate pH value of buffer solution