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.
- OH-accepted proton, it is a base. - An acid is changed into a base and a base is changed into an acid. - These pairs of acids and bases are called conjugate acid-base pairs. - A conjugate acid-base pair differ from each other only by a proton. WEAK ACIDS AND BASES For weak acids and bases, the concentration of acid (base) is not the concentration of [H + ] ([OH - ]). Weak Acids Dissociated ions are in equilibrium with undissociated molecule.