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

Standarisation of Sodium Hydroxide Solution

Extracts from this document...


Standarisation of Sodium Hydroxide Solution Aim: To investigate the concentration of Sodium Hydroxide. Identification of Variables: Dependent variable: * The volume of Hydrochloric acid used in titration. Independent variable: * The concentration of Sodium Hydroxide used in the experiment. Controlled variables: * The volume of Sodium Hydroxide used in titration process * The concentration of Hydrochloric acid. Materials required: o 0.1 mol dm-3 Hydrochloric acid solution o Sodium Hydroxide solution o Phenolphthalein o 50 mL Burette o 25 mL pipette o Dropping pipettes o 10 mL beaker glass o 100 mL conical glasses o Clamp stand Procedure: 1. Using the appropriate technique pipette 25 mL of NaOH solution into a 100 mL conical flask. 2. Add 1 drop of phenolphthalein to the NaOH solution. 3. Pour approximately 35 mL of 0.1 mol dm-3 HCl to the burette. 4. Place the NaOH solution below burette. ...read more.


NaOH = No of mol of HCl titrated Concentration of NaOH = No of mol of NaOH / volume of NaOH Average of volume of HCl titrated [mL] (� 0.2 mL) 9.15 No of mol of HCl titrated [mol] (� 2%) 0.000915 No of mol of NaOH [mol] (� 2%) 0.000915 Concentration of NaOH [mol dm-3 ] (� 2%) 0.0366 Evaluation of Experimental Procedure: The estimated systematic error could occur when I did the 1st experiment, as the result was not close to the other two results. This is related to the rapid titration that I did to find the rough estimate. The result became not accurate. The main concern is the used of secondary standard. HCl has small Mr, therefore in calculation process; the percentage of error would be larger. It means that the error could increase. I could decrease the error by using primary standard, which are KHP or Na2O3 . ...read more.


Because everybody has their own opinion whether the solution is colorless enough or not. Perhaps I made a wrong decision when I stopped the titration - whether it was too early or too late - therefore it would be better if I used digital pH meter. I could stop the titration when the digital pH meter showed that the pH was 7 - which is neutral- and it would decrease the error. Moreover, digital pH meter has an exact uncertainty; therefore the result would be even more accurate. From my experience in the 1st titration, I should shake the NaOH solution gently when I was doing titration. It made the solution mixed quickly, and it would reduce the error. I think another sources of error were small, as the apparatus used to measure the solutions have relatively small uncertainties such as burette (0.05 mL) and pipette (0.1 mL), and I followed the rest of the procedure correctly. Conclusion: The concentration of the NaOH solution used in this experiment is approximately 0.0366 �2% mol dm-3. ?? ?? ?? ?? ...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 find the identity of X(OH)2 (a group II metal hydroxide) by determining ...

    the same brand. By using the same batch ensures that the reactant concentration is the same. If another batch were to be used causes the concentration to differ. This causes the HCl obtained to be different. 5. Same equipment, method, room temperature The method would be kept the same and

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

    To begin with there will be no base but when 1cm3 of Sodium Hydroxide is added then there is 1mL of Sodium Hydroxide in the conical flask. Then when another 1 cm3 of Sodium Hydroxide is added there will be 2mL of Sodium Hydroxide in the conical flask.

  1. Enthalpy Of Solution

    We can assume that the density of water is 1000g / dm3. 4 NaOH has got a molar mass of (MNa + MO + MH) 23 + 16 + 1 = 40 g / mole. The Procedure recommended the use of 0.1 moles of NaOH.

  2. Experimental Molar Enthalpy of Neutralization for Sodium Hydroxide Solution

    As a result, this is a reason contributing to the large enthalpy change in this lab; however, this reason is not very significant as the substances cannot be so impure the concentration on the label is extremely different then the concentration found in the bottle (it is illegal to put false information on chemical substances).

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

    To set up the equipment appropriately, use a 10cm3 Measuring Cylinder to measure out 10ml of vegetable oil, and keep aside separately. Measure 1.5ml of the 5g/100ml (1%) Potassium Hydroxide solution and place set aside in the measuring cylinder. Set up the magnetic stirrer, and measure the temperature of the oil using the thermometer.

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

    0.00263 M It is given that the concentration of NaOH solution is approximately 0.1M. So if we take this as the literature value Discrepancy = (experimental yield-theoretical yield/ literature value)x 100 = {(0.097450-0.100000)/0.1}x 100 = 2.55 % Conclusion The main aim of this experiment was to find out the concentration

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