chem lab

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    Created by @_nj_1812

    What is the aim of the estimation of mixture of acids by conductometry?

    To determine the amount of acids in a given solution.

    What happens to conductance during the titration of H+ ions with NaOH?

    Conductance decreases as H+ ions are replaced by slower Na+ ions.

    What is the consequence of adding NaOH after complete neutralization of acetic acid?

    Conductance increases rapidly due to sodium acetate formation.

    How is the initial conductance of an acid mixture characterized?

    It is primarily due to fast-moving H+ ions.

    What apparatus is used in the estimation of mixture of acids by conductometry?

    A conductivity meter, beaker, and burette are required.

    What should be done with the conductivity cell before measuring conductance?

    It must be rinsed thoroughly with distilled water.

    What does a plot of NaOH volume versus conductance indicate?

    It shows two intersection points for strong and weak acid titrations.

    What is the role of distilled water in preparing the acid solution?

    It dilutes the acid to a specific volume for accurate measurement.

    What is the importance of attesting concordant readings?

    It ensures accuracy before proceeding with the experiment.

    What should students do if they break glassware during the experiment?

    Inform staff immediately and sign the breakage register.

    What happens to conductance when NaOH is added initially?

    Conductance decreases before increasing.

    What indicates the first end point in a titration graph?

    The first intersection of the conductance and volume lines.

    How is the second end point of titration determined?

    By calculating V3 - V1 from the graph.

    What is the normality of the NaOH used in the titration?

    0.2 N.

    What is the role of potassium dichromate in estimating ferrous ions?

    It oxidizes ferrous ions to ferric ions.

    What does the Nernst equation calculate in the potentiometry process?

    The emf of the electrode.

    What happens to emf at the end point of the ferrous-ferric titration?

    There is a sharp increase in emf.

    What apparatus is used to measure emf in the ferrous ion estimation?

    A potentiometer.

    What is the consequence of adding K2Cr2O7 to the ferrous solution?

    It leads to a large increase in emf near the end point.

    What is the purpose of the platinum electrode in the experiment?

    It serves as the indicator electrode.