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  Sometimes, it becomes difficult to calculate the exact weight of the solute. Under this condition, the concentration of prepared solution becomes different from proposed solution and the term normality factor must be introduced. Mathematically,  Normality factor= (Weight taken) / (weight to be taken) Normality factor indicates by how many times the concentration of prepared solution is different from proposed solution.   For eg: If we have to prepare 500ml decinormal oxalic acid solution, the weight we have to take is 3.15gm. In lab due to certain difficulties, if weight is taken as 3.10 gm, then normality factor will be equivalent to =3.1/3.15 = 0.98 and concentration is expressed as N/10 (f=0.98) It indicates that the concentration of prepared solution is 0.98 times than that of proposed concentration. Selection of indicator in acid base titration:       In acid base titration the completion of reaction is usually indicated by using the t...

Introduction to computer system   A computer system consists of hardware, system programs and various application programs.                                             (fig: Computer system) Computer system have a capability for gathering data, performing computations, storing information, communicating with other computer systems and generating output. The hardware (the central processing unit, the memory and the input-output devices) provides the basic computing resources for system. The application programs such as word processing, compilers and assemblers defines the way in which these resources and co-ordinates the use of the hardware among the various application programs for the various system users.  The operating system provides the means for proper use of these resources in the operation of the computer system. Definition of operating system:  ...

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