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The purpose of this experiment is to to prepare a solution of primary standard of potassium hydrogenphthalate C8H5O4K, which can be used to standardise water-soluble bases such as sodium hydroxide solution.

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Introduction

Preparing a solution of primary standard. Purpose The purpose of this experiment is to to prepare a solution of primary standard of potassium hydrogenphthalate C8H5O4K, which can be used to standardise water-soluble bases such as sodium hydroxide solution. Formula: n= m/M and c= n/V Theory Many common reagents are supplied in an impure state or they can easily pick up moisture from the atmosphere, or may be supplied as concentrated solutions of an uncertain concentration. As a consequence, solutions made from such substances must be stanardised against a substance of known purity. ...read more.

Middle

� I added about 100 ml of distilled water to the beaker and stired it until it dissolved the hydrogenphthalate. � I transferred the solution from the beaker to a 250 cm3 voumetric flask. i washed the beaker several times and poured the content into the volumetric flask just to make sure that no residue of the chemical was left in the beaker. � I put in more distilled water in the volumetric flask until the volume was 250 cm3 and mixed it thoroughly. � I labeled my flask with my initials, date and content. ...read more.

Conclusion

g +_ .002 +_ 0.385% amount of potassium hydrogenphthalate, n= m/M 0.024 moles +_0.475% We also know the volume of the solution to be 25 dm3, so putting all these values in the formula. uncetainty for volume: +_ 0.0005% c = n/V so concentration of potassium hydrogenphthalate c= 0.09612 mol/dm3 % uncertainty :0.00012%+0.475%= .47512% Uncertainty/Error Tap water contains chemicals and other impurities and is not suitable for making up solutions so we should always use distilled water for making solution. i have also noted margin of error of different appratus and all calculations have been made keeping in mind the margin of error. Haroon Sahibi 2i ...read more.

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