Determine the ph of a 0.227 m c5h5n solution at 25°c. the kb of c5h5n is 1.7 × 10-9.

 the concentration of OH- using the formula:
[OH-] = Kw / [H+]

[OH-] = 1.0 x 10^-14 / ( [(1.7 x 10^-9) (0.227)]^2 )

[OH-] = 5.1 x 10^-10

To find the pOH, use the formula:
pOH = -log [OH-]

pOH = -log [5.1 x 10^-10]
pOH = 9.29

Gallium melts near room temperature and has one of the largest  liquid  ranges of any metal, so it has found use in high temperature thermometers.