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The choice of the second buffer depends on your application: if you measure values below pH 7, use pH 4 as a second buffer. If you measure values above pH 7, use pH 10 as your second buffer. Some of our pH meter use 3 points calibration, keep in mind to always start with pH 7 first and others after.
This is not a standard âtitrationââyou want to generate a full âcurveâ. First measure and record the pH of your solution BEFORE adding any NaOH solution (volume added = 0.00 mL). Then add ~2 mL and record the new buret reading (precisely!) and the corresponding pH. level down to 0.00 mL by draining out the appropriate amount via the stopcock (strictly speaking you need not start at precisely 0.00 mL, but when making a titration curve, it is very convenient to do so because then your volume READINGS will equal your âvolume addedâ).