• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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.

Extracts from this document...

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. Acid Base Titration Lab Report. The purpose of this experiment is to determine ...

    This is both a random and systematic error. 3. Titrating without removing the air bubble from the burette tap. Air bubbles increase the volume of liquid in the burette. Chances are that when there are air bubbles in the burette before titration, the results will have more inaccuracies. Always check for air bubbles before starting the titration.

  2. Determination of potassium hydrogen carbonate into potassium carbonate

    The calculation is, Moles = mass/Mr Therefore the Mr of K2CO3 = (2 X K) + (1 X C) + (3 X 0) Mr = (2 X 39.10) + 12.01 + (3 X 16) = 138.01 Therefore as the mass is 2.671, then Moles = 2.67/ 138.21 = 0.0193 M

  1. Free essay

    Vitamin C in Fruit Juices

    Final Burette Volume (mL) Iodine Used (mL) Golden Circle Tropical Punch (10.0mL) 1 0 25.70 25.70 2 0 25.64 25.64 3 0 25.66 25.66 4 0 25.60 25.60 Average 25.65 TABLE 3 - Titration Data Substance Trail Initial Burette Volume (mL)

  2. DCP+CE Analysis of a Hydrogen Peroxide Solution

    These two half equations are; The theoretical value of the concentration of hydrogen peroxide was 0.35% (Dr Badran), as provided from teacher. The value gained from the experiments was 0.34% with the uncertainty of 0.015%. There is only 0.01% difference between the theoretical value and the gained value from the experiment.

  1. Experimental Molar Enthalpy of Neutralization for Sodium Hydroxide Solution

    As a result, the impurity of the substances cannot account for all the errors in this lab. Purifying the substances beforehand can easily eliminate this source of error. Moving on, there is another reason contributing to the large enthalpy change.

  2. Biodiesel Investigation - How the concentration of Potassium Hydroxide solution would affect the yield ...

    that would affect the yield of biodiesel produced in experiment. The research question for this is: How the concentration of Potassium Hydroxide solution would affect the yield of biodiesel when transesterified with a standard sample of vegetable oil. Background: To look at the scientific aspect of it, biodiesels are a

  1. The purpose of this experiment is to determine the concentration of a solution of ...

    Error calculation Volume of the acid = (inaccuracy/volume) x100 = (0.06/25)x100 =0.24% = ± 0.06ml Concentration of acid = (inaccuracy of moles+ inaccuracy of volume of solution) = 0.04%+0.24% (inaccuracy is obtained from the previous experiment) = 0.28% = ± 0.0027286M Volume of NaOH = (inaccuracy/volume)

  2. The chemistry of atmospheric and water pollution.

    Thus the earth?s heat is trapped in the stratosphere, raising the temperature of the earth. This small increase in temperature can have huge effects on aquatic organisms such as plankton who cannot cope with this change. Thus organisms dependant on plankton (food chain)

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work