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

The use of volumetric flask, burette and pipette in determining the concentration of NaOH solution

Extracts from this document...

Introduction

Experiment 2 Name Teoh Han Xuan ID No 11ADB05289 Partners Name Loo De Jing Date 13 June 2012 Title The use of volumetric flask, burette and pipette in determining the concentration of NaOH solution Objectives 1. To carry out acid base titration 2. To determine the end point with the use of indicators such as phenolphthalein Introduction In a titration, a burette is used to dispense measured increments of one solution into a known volume of another solution. The object of the titration is the detection of the equivalence point. In the reaction of HCl and Naoh, the equivalence point does occur when same mole of HCl has reacted with same mole of NaOH. The titration technique can be applied to many types of reactions, including oxidation-reduction, precipitation, complexation and acid-base neutralization reactions. An indicator is a substance that undergoes a distinct color change occurs is called the end point of titration, the indicator used in a titration must be selected carefully. Material & Apparatus NaOH solution, HCl solution, Phenolphthalein solution, Beaker, Burette, Pipette, Volumetric flask, Erlenmeyer flask, Funnel, Watch Glass Procedures 1. The volumetric flask was cleaned and rinsed with distilled water 2. ...read more.

Middle

The ionic equation is shown below: 1. HIn H+ + In- An indicator is added to the solution being titrated. The indicator is a substance that changes color when the reaction is complete. Phenolphthalein, which is a commonly used acidâbase indicator, is added to the nitric acid solution in the Erlenmeyer flask. Phenolphthalein has two chemical forms. In acidic conditions, it is in the acid form, which is colorless. In basic conditions, an H+ ion is removed from each phenolphthalein molecule, converting it to its base form, which is red. Furthermore, weak acids are titrated in the presence of indicators which change under alkaline conditions while weak bases are titrated by the indicator that under acidic conditions. Moreover, the indicator does not change color from pure acid to pure alkaline at specific hydrogen ion concentration, but rather, color change occurs over a range of hydrogen ion concentrations. Some common acid base indicators can be used. Tried and true indicators are bromphenol blue, bromcresol green, methyl red, bromthymol blue, phenol red, neutral red, phenolphthalein and so forth. Indicators pH Range Acid Base Bromphenol blue 3.0-4.6 Yellow Blue – violet Bromcresol green 4.0-5.6 Yellow Blue Methyl red 4.4-6.2 Red Yellow Bromphenol blue 6.2-7.6 Yellow Blue Phenol red 6.4-8.0 Yellow Red Neutral red 6.8-8.0 ...read more.

Conclusion

The meniscus is the curved upper surface of the liquid in a burette. When viewing the burette with the volumetric scale toward you, follow the lowest point at the surface of the liquid to the wall of the burette. Read the volumetric scale at this point. It is essential that the meniscus be at eye level when determining the volume. Furthermore, always add acid to water, not water to acid, to avoid excess heat formation and spitting of acid. Stir solution while adding acid. Acid strength use the terms "strong" and "weak" to give an indication of the strength of an acid. The terms strong and weak describe the ability of acid solutions to conduct electricity. If the acid conducts electricity strongly, it is a strong acid. If the acid conducts electricity weakly, it is a weak acid or base. Moreover, acid concentration is well defined that how many acid molecules per unit volume in the solution. A weak base is a chemical base that does not ionize fully in an aqueous solution, defining as a chemical base in which protonation is incomplete. Nonetheless, Insoluble Bases are usually the Metal Oxides such as Magnesium Oxide, Copper (II) Oxide, Lead (II) Oxide, Iron (III) Oxide and Iron (II) Oxide. Conclusion: The initial concentration of NaOH is 0.01M. The average volume of NaOH used is 26.79 mL. ...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. Aim: To determine the concentration of chloride ions in sea water by titration ...

    Collect silver nitrate solution (F1) in other 100cm3 beaker and mark it as such. 7) Attach clamp to retort stand and ensure that it is secure. 8) Attach burette to retort stand. Ensure that the burette is securely held.

  2. Investigate the rate of reaction of luminol in various factors. The objective was to ...

    There is a small rise around 0.18M to 0.24M. It could be human error or equipment error. To find the order of the reaction with respect to H2O2, the graph has to be modified. The molarity (concentration) now will go to the y-axis and the time for chemiluminescence will go to the x-axis.

  1. IB chemistry revision notes

    The H�ber Process (Production of Ammonia) * * needs catalyst --> Fe or Pt * High activation energy. * Forward reaction is exothermic. Backward is endothermic. * Forward reaction is initially very fact as there's lots of starting material (high pressure or concentration). The backward reaction is initially very slow.

  2. pKa. When constant successive portions of Sodium Hydroxide are added to Acetic Acid; how ...

    Automatically, a pH reading appeared on the screen 4. When enough data was collected the recorded was stopped and the probe was unplugged 5. The GLX pH probe was then plugged into a laptop to export the data to the computer's hard drive Using Mohr Pipette method: 1. The standard bulb was attached to the end of the pipette

  1. Aim. To find the identity of X(OH)2 (a group II metal hydroxide) by determining ...

    cm3 and the uncertainty due to the smallest unit of measurement being 0.1 cm3 Therefore 0.1/2= � 0.050 cm3 Percentage uncertainty = (0.05 /19.675) X 100 = 0.254% Therefore total uncertainty = 0.400% + 0.254% = 0.654% Conclusion and Evaluation: X(OH)2 is most likely to be Ca(OH)2 as the calculated solubility is closest to the literature value given of Ca(OH)2.

  2. To determine the standard enthalpy of formation of Magnesium Oxide using Hess Law.

    Figure 1: Zoomed in view of the y-axis and horizontal line intersection. From the figure, the value for the maximum temperature reached can be safely estimated to be 40.7oC. Since the maximum temperature reached by the solution of 15cm3 water has been determined to be 40.7oC and the room temperature

  1. Measuring the fatty acid percentage of the reused sunflower oil after numerous times of ...

    Fatty acids are produced by the hydrolysis of the ester linkages which are the bonding between fatty acids and glycerol that characterizes true fats, in a fat or biological oil (both of which are triglycerides), with the removal of glycerol.

  2. Chemistry Titration Acid Base Lab

    On the other hand, sodium hydroxide contains sodium acetate which raises the pH considerably of the vinegar as it is fairly basic. Therefore, the equivalence point will be greater than seven and more specifically approximate to 9. All of the indicators that were used did not have a pH range above 9 except for phenolphthalein.

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