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Preparing a Standard Solution

S
sweemoi khor

1. Weigh out 8.0g of solid sodium hydroxide and dissolve it in 25cm3 of water in a beaker. 2. Pour the solution into a 100cm3 volumetric flask and rinse the beaker and weighing bottle with water, adding the rinse water to the flask. 3. Add distilled water dropwise until the solution reaches the 100cm3 mark. Shake well to mix.

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To prepare a 100 cm3 of 2 mol dm-3 sodium hydroxide solution 1 5 Add distilled water until the calibration mark Determine the mass of solid sodium hydroxide Shake well 4 2 The mass of solid 3 sodium hydroxide needed is weighed Transfer the solution to a 100 cm3 volumetric flask Rinse the beaker and Dissolve the solid sodium add the washing into hydroxide in distilled water the flask
Prepare a standard solution To prepare a 100 cm3 of 2 mol dm-3 sodium hydroxide solution Steps: Determine the mass of solid NaOH needed 8.0 g of solid NaOH is weighed in a weighing bottle by using an electronic balance The solid NaOH is dissolved in about 25 cm3 of water into a beaker The solution is poured into a 100cm3 volumetric flask.Why step 5 is needed? The beaker and the weighing bottle are rinsed with distilled water. The washings are then poured into the volumetric flask. Distilled water is added into the volumetric flask and a dropper is used to add water drop by drop to finally bring the volume of solution to the 100 cm3 mark. The volumetric flask is stoppered, then inverted and shaken until a homogeneous solution of NaOH is obtained
Prepare a solution with dilution method To prepare 100 cm3 of 0.20 mol dm-3 sodium hydroxide solution from 2 mol dm-3 sodium hydroxide using dilution method Dilution formula M1V1 = M2V2 M1 = molarity of the solution before dilution V1 = volume of the solution before dilution M2 = molarity of the solution after dilution V2 = volume of the solution after dilution
Prepare 100 cm3 of 0.2 mol dm-3 sodium hydroxide solution from 2.0 mol dm-3 sodium hydroxide solution using dilution method 2 1 3 4

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Preparing a Standard Solution

  • 1. To prepare a 100 cm3 of 2 mol dm-3 sodium hydroxide solution 1 5 Add distilled water until the calibration mark Determine the mass of solid sodium hydroxide Shake well 4 2 The mass of solid 3 sodium hydroxide needed is weighed Transfer the solution to a 100 cm3 volumetric flask Rinse the beaker and Dissolve the solid sodium add the washing into hydroxide in distilled water the flask
  • 2. Prepare a standard solution To prepare a 100 cm3 of 2 mol dm-3 sodium hydroxide solution Steps: Determine the mass of solid NaOH needed 8.0 g of solid NaOH is weighed in a weighing bottle by using an electronic balance The solid NaOH is dissolved in about 25 cm3 of water into a beaker The solution is poured into a 100cm3 volumetric flask.Why step 5 is needed? The beaker and the weighing bottle are rinsed with distilled water. The washings are then poured into the volumetric flask. Distilled water is added into the volumetric flask and a dropper is used to add water drop by drop to finally bring the volume of solution to the 100 cm3 mark. The volumetric flask is stoppered, then inverted and shaken until a homogeneous solution of NaOH is obtained
  • 3. Prepare a solution with dilution method To prepare 100 cm3 of 0.20 mol dm-3 sodium hydroxide solution from 2 mol dm-3 sodium hydroxide using dilution method Dilution formula M1V1 = M2V2 M1 = molarity of the solution before dilution V1 = volume of the solution before dilution M2 = molarity of the solution after dilution V2 = volume of the solution after dilution
  • 4. Prepare 100 cm3 of 0.2 mol dm-3 sodium hydroxide solution from 2.0 mol dm-3 sodium hydroxide solution using dilution method 2 1 3 4