alkaline slant / acid butt (K / A): slant is alkaline (red) indicates glucose degradation. Born in conditions requiring oxygen only Yellow indicates acid yield. Red indicates an alkaline state. Acid slant / acid butt (A / A): ferment microorganisms, both lactose and glucose, yellowing in both the buttocks and the slanting surface.
acid It is a substance that reacts with bases. In general, acids can be identified by their sour taste, reactive properties with metals such as calcium. And bases like sodium carbonate. Water-soluble acids have a pH of less than 7, with the acid becoming stronger with lower pH and changing the blue litmus paper to red.
Typical examples of acids include vinegar (vinegar), sulfuric acid (in car batteries), and tartaric acid (in baking). Acids can be either a solution. Liquids or solids for gases such as hydrogen chloride Can be acidic as well. Some strong and weak acids are corrosive. But there are exceptions such as carbonate and boric acid.
There are three general acid definitions: Arrhenius definition. Definition of Berinstead-Laowry And definition of Lewis Arrhenius says that an acid is a substance that increases the concentration of hydronium ions (H3O +) in a solution. Most of the acids found in daily life are aqueous solutions. Or can be dissolved in water And these two definitions are most relevant.The reason that the pH of the acid is less than 7 is because the hydronium ion concentration is greater than 10-7 mol per liter, since pH is defined as the negative logarithm of the hydronium ion concentration. Therefore having a pH less than 7 by definition Berinstead-Lavri Any compound capable of giving a simple proton can be considered an acid. Examples contain alcohols and amines that have an O-H or N-H group.
Chemically, the Lewis acid definition is the most common definition. Lewis acid is a lone electron pair acceptor. Lewis acid example Including all metal negative ions And less electron molecules like boron fluoride And aluminum trichloride Hydronium ions are acidic according to the three definitions above. Interesting is Even alcohol and amines can form bryinsate-lavrie as described above. Both can also act as Lewis bases. This is because oxygen and nitrogen atoms have lone electron pairs.
Answer:
Acid slant: yellow, fermentation of glucose and lactose and/or sucrose. High concentration creates excessive acid formation
Alkaline slant: red, limited glucose in the medium and limited acid formation.
