What is meant by the term, standard solution? Define the following solution conc

Question

What is meant by the term, standard solution? Define the following solution concentration: Molar Normal How is the end point of the titrations determined in this experiment? What is used to determine the end points in this experiment? If you over shoot the end point in the titration of the HCI solution, what can be done to correct this? In this experiment, you will standardize your NaOH solution with a solid primary standard acid, potassium hydrogen phthalate (KHC_2H_4O_4). If a 0.500 grams sample of this acid was titrated with 24.5 mL of a NaOH solution, what Is the concentration of the NaOH solution? List some major sources of error that can occur in this experiment.

Explanation / Answer

1) It is a solution of known concentration. In acid base titrations we used KHP as the acid standard. We weighed it to 0.5 g and made the solution up to a certain volume in a volumetric flask. We then standardized the base by titration. KHP was thus the primary standard and NaOH the secondary std.

2)molar: the number of moles of solute present in one litre of the solution is called as a molar solution.

normal: the number of of equivalents present in one litre of solution is called as normal solution.

3)in acid base titration when an indicator which gives a coluour in one of the solutions is added so the colour of the indicator will be changed at the end point of the titration.

in this experiment we use phenolphthalien indicator.

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