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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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. We call them primary standards.

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Chemicals

  •  Potassium hydrogenphthalate (C8H5O4K)

Apparatus

  • top loading balance (weighing scale)
  • weighing bottle
  • beaker
  • volumetric flask

Procedure

  • We started by weighing  5 g of potassium hydrogenphthalate accurately in a weighing bottle.
  • I poured the content of the weighing bottle into a beaker and i reweighed the the weighing bottle. I also made sure that no residue of the chemical was left in the weighing bottle.
  • 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 ...

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