Base (chemistry) increase the hydronium (HO) concentration in water, whereas bases reduce this concentration. A reaction between an acid and base is called neutralization. In a neutralization reaction, an aqueous solution of a base reacts with an aqueous solution of an acid to produce a solution of water and salt in which the salt separates into its component ions. If the aqueous solution is saturated with a given salt solute, any additional such salt precipitates out of the solution. The notion of a base as a concept in chemistry was first introduced by the French chemist Guillaume François Rouelle in 1754. He
A Murder Is Announced text is necessary if a correct solution of the mystery is to be arrived at before the astute Miss Marple unmasks the culprit." The review concluded, "Miss Christie has several surprises up her sleeve besides the main one, and (this much may be said without spoiling the reader’s pleasure) she once again breaks new ground by creating a weak and kindly murderer who is yet responsible for the deaths of three people: that such a character should, in the last analysis, seem credible, is a tribute to the author’s psychological acumen and originality of concept." Maurice Richardson, in the 4