Experiment 7 When performing acid-base titrations, the first step is often a sta

Question

Experiment 7 When performing acid-base titrations, the first step is often a standardization of the titrant, which s an accurate determination of its concentration. Acidic titrants might be standardized in titration of a well-defined amount of a solid base, such as sodium carbonate. In such a procedure, why is it not necessary to know the exact amount of water used n preparation of a solution of Na2CO3 used n standardization of an acid? The standardization of an acid might also be carried out using a solution of a base with known concentration. For example, it is found that 37.60 ml of 0.210 M NaOH are required to neutralize 25.05 ml of H2SO4 solution n a titration experiment. Calculate the molarity and normality of the H2SO4 solution. In the example given above, the amount of acid to be titrated has to be delivered by a pipet so that its volume is accurately known. However, the solution of the acid is often diluted to facilitate the titration process. Explain why additional de-ionized water might be added without affecting the results of the titration.

Explanation / Answer

It is essential to know the exact amount of water used in preparation of sodium carbonate why because to get accurate endpoint.

             NaOH                                                                 H2SO4

M1 =.210         V1=37.60                                                   M2=?     V2=25.05

    M1V1=M2V2

                                   M2=.210X37.6/25.05

                                         =0.311

       FOR H2SO4 Normality=2M

                                         =2X.311

                                         =.622

                        

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