uses of crystals

Crystallization - This technique is used for obtaining a compound in pure solid form of well-defined geometrically shaped crystals. This process of crystallization can be used for the purification of a compound only when the compound and the impurit..

This technique is used for obtaining a compound in pure solid form of well-defined geometrically shaped crystals. This process of crystallization can be used for the purification of a compound only when the compound and the impurities present in it diff..

Large, well formed crystals can be obtained, by the slow evaporation of a cold and saturated solution of the substance. A large crystal can be grown by suspending a small well formed crystal, in a cold and saturated solution of the substance. The solution must be taken..

Another type of microphone, widely used in public-address systems, depends for its action on the piezoelectric effect possessed by certain crystals, for example Rochelle salt. The term piezoelectric effect refers to the fact that when pressure is applied on the crystal..

Fractional crystallization or fractional distillation cannot bring about resolution. This is because the enantiomorphs have identical physical properties. Some of the methods used for resolution are a) Mechanical separation b) Biochemical separation c) Salt formation d) Selecti..

X-Ray Study of Crystals - In a crystalline solid, the constituent particles (atoms, ions or molecules) are arranged in a regular order. An interaction of a particular crystalline solid with X-rays helps in investigating its actual structure. Crystals are found to act as diffract..

This involves the release of energy referred as lattice energy (U). The various energy changes in different steps are as shown: Born Haber Cycle for NaCl The sum of the energy changes taking place during various steps is equal to D H f i.e., heat of formation of NaCl ( s ) according ..

Uses of Ammonia - Following are the chief uses of ammonia: 1) Ammonia is used in the industrial preparation of nitric acid by Ostwald's process. 2) Fertilisers, such as ammonium sulphate, ammonium nitrate, ammonium phosphate, urea etc. are manufactured with the help of..

Take a glass tube with graduation from 0 to 100 ml. Close the lower end by a rubber stopper, and pour into it a saturated solution of sodium hydroxide up to the 0 mark. Add a few crystals of white pyrogallol (about 0.5 g) into the glass tube. Now close the upper end with a glass stopper,..

When the (+) and (-) isomers or their salts form well defined crystals showing hemihedral faces, hand picking is used to separate them. Pasteur separated sodium ammonium racemate crystals by mechanical separation in 1848. Below a certain temperature the enantiomorphs ..