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  Viva Questions with Answers on Quantitative Estimation (Volumetric Analysis) 1. Why should weights not be lifted with hand ? Ans.   This causes error in the weighing because some matter may be transferred from the hand to the weight. 2. Why is front door of the balance closed during weighing ? Ans.   Opening the front door causes vibrations in the pan due to operator’s breath or air currents which leads to inaccurate results. 3. What is the maximum weight that can be weighed in a chemical balance ? Ans.  100 grams. 4. What is the weight of a rider ? Ans.  10 mg. 5. What is the use of a rider ? Ans.  A rider is used for weights less than 10 mg. 6. What is the principle of volumetric analysis ? Ans.  In volumetric analysis, the concentration of a solution is determined by allowing a known volume of this to react quantitatively with another solution of known concentration. 7. What is titration ? Ans.  The process of adding one solution from the burette to another in the titration flask