PH of neutrality is not exactly 7 (25 °C), although this is a good approximation in most cases. Neutrality is defined as the condition where [H] = [OH] (or the activities are equal). Since self-ionization of water holds the product of these concentration [H]×[OH] = K, it can be seen that at neutrality [H] = [OH] = , or pH = pK/2. pK is approximately 14 but depends on ionic strength and temperature, and so the pH of neutrality does also. Pure water and a solution of NaCl in pure water are both neutral, since dissociation of water produces equal numbers
Milk-alkali syndrome most gastric ulcers was identified and drugs other than antacids were developed to treat heartburn - namely acid-reducing drugs like H2-receptor antagonists or proton pump inhibitors - the incidence of milk-alkali syndrome greatly diminished. However, as a result of increased osteoporosis awareness and the routine use of calcium supplements to prevent it, the incidence has again increased. Milk-alkali syndrome In medicine, milk-alkali syndrome is characterized by high blood calcium and metabolic alkalosis caused by taking in too much calcium and absorbable alkali; common sources of calcium and alkali are dietary supplements taken to prevent osteoporosis and antacids. If untreated, milk-alkali