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.
Conjugate Acid-Base Pairs. Acids and bases exist as conjugate acid-base pairs. The term conjugate comes from the Latin stems meaning joined together and refers to things that are joined, particularly in pairs, such as Brnsted acids and bases. Every time a Brnsted acid acts as an H+-ion donor, it forms a conjugate base. Imagine a generic acid, HA. When this acid donates an H+ ion to water, one product of the reaction is the A- ion, which is a hydrogen-ion acceptor, or Brnsted base.