Men's hats are sized according to diameter while women's are based on circumference. The most common hat size for men is 7 1/8 and for women, 221. To measure the size of a person's head, use a flexible tape measure to measure the circumference at the widest part of the head, usually an inch above the eyebrows.
Arrhenius argued that bases are neutral compounds that either dissociate or ionize in water to give OH-ions and a positive ion. NaOH is an Arrhenius base because it dissociates in water to give the hydroxide (OH -) and sodium (Na +) ions.
A salt is formed when the cation (positive ion) of an acid forms a compound with the anion (negative ion) of a base. The neutralization of a strong acid and a strong base results in a solution with a pH of 7 (neutral pH). The following is a table of common strong acids and strong bases: