Mostly found on the soles of feet, palms, forehead, cheeks and of course armpits they're also called eccrine sweat glands
You may suppose you have a 0.1 M solution of NH3, from:
NH4Cl + NaOH > NH3 + H2O.
Then you can compute the pH from the concentration of NH3 and its pKb.
The concentration is high enough to use the simplified formula:
[OH] = sqr(Kb*conc)
The answer is 12.4.I think its correct answer.