The logarithmic scale of pH means that as pH increases, the H+ concentration will decrease by a power of 10. Thus at a pH of 0, H+ has a concentration of 1 M. At a pH of 7, this decreases to 0.0000001 M. At a pH of 14, there is only 0.00000000000001 M H+.
HSA distributions. The IRS requires you to prepare Form 8889 and attach it to your tax return when you take a distribution from an HSA. However, if your 1099-SA indicates you did not use the distribution for qualified medical expenses, you will pay income tax on the portion you used for unqualified expenses.
Hidradenitis suppurativa. Hidradenitis suppurativa (HS), also known as acne inversa, is a chronic skin disease characterized by clusters of abscesses or subcutaneous boil-like infections (often free of actual bacteria) that most commonly affects the underarms, under the breasts, inner thighs, groin, and buttocks.