In lab, buffers solution based onto a 0.1 M solution of sodium phosphate at pH7.0. Within this system, there are three of pKAs like: 12.7, 7.21 and 2.12.
Determine the concentration of hydroxide ion in this buffer?
Ans:
pOH = 14-pH = 14 - 7 = 7
[OH] = 1.0 x 10-7 M