Being the product of a neutralization reaction between an acid and a base, sodium chloride is neutral, with a pH of seven. Sodium chloride is an ionic compound with the chemical formula NaCl. Continue Reading.
A D-width is considered a medium for men and a wide for women. It measures between 3 and 5 inches across the bottom of the ball of the foot, depending on your shoe size. For instance, in men's footwear, a size 10D is 4 inches across, while a size 14D is 4.5 inches across.
Shoes come in many different widths in addition to the standard length size. These different widths accommodate people with wider or narrower feet than the standard width. Widths use letters as a scale instead of numbers; as the widths increase, so do the letters. On the narrow end of the spectrum, more A's means a narrower shoe, while on the wide end, more E's means a wider shoe.