Buffer solution, pH 4.0 ± 0.02 is used to establish and maintain an ion activity within narrow range. It is most commonly used to establish hydrogen-ion activity for the calibration of pH meters, in analytical procedures. It is also used to maintain stability of various dosage forms.
Calcium chloride is an a white crystalline solid at room temperature, and it is highly soluble in water.
It has several common applications such as brine for refrigeration plants, ice and dust control on roads, and in cement.
It can be produced directly from limestone, but large amounts are also produced as a by-product of the Solvay process. Because of its hygroscopic nature, it must be kept in tightly-sealed containers.
Nickel (II) Sulphate Heptahydrate-It is used in electroplating and as a chemical intermediate to produce other types of nickel compounds. Nickel Sulfate is a by-product of copper refining and it naturally occurs as a rare mineral which is retgersite.
Buffer Capsules pH 9.2-One has to simply dissolve capsule to 100 ml deionized or distilled water and a solution of the specified pH will be ready for use.
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