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

Determine the relative formula mass and the molecular formula of succinic acid

Extracts from this document...

Introduction

Experiment: To determine the relative formula mass and the molecular formula of succinic acid Aim: Using volumetric analysis, with a known standard solution of NaOH, to titrate a solution of succinic acid to determine its molar concentration and hence it's molecular mass. Principle: Given that succinic acid is a dibasic acid with the molecular formula HOOC - (CH2) n - COOH where n is a number between 1 and 4 (both inclusive). H2 A + 2NaOH Na2A + 2H2O 1 Mole 2 moles In the experiment a standard solution of succinic acid with a known gram - concentration is allowed to titrate to equilibrium with a convenient quantity of 25 cm3 of the standard solution of NaOH provided. Assume that the concentration of standard solution of NaOH be 0.1M.dm-3 No. of moles of NaOH in 25 cm3 of the solution = 0.0025 moles Since the mole ratio of acid : alkali is 1:2, No. of moles of acid required to neutralize 25 cm3 of the solution of Na OH = 0.0025/2 =0.00125 moles Assuming the n=3, Mr of succinic acid =132 Since Mr = m / M, the mass of succinic acid required = 132*0.00125 = 1.65g. ...read more.

Middle

* Add three drops of phenolphthalein indicator to NaOH. The solution turns pink. * Rinse a clean dry burette with acid solution * The burette is placed on the stand, making sure it is vertical and then fill with the acid solution using a funnel up to about 2cm3 above the 0.00cm3 level. * Run acid through the tap to remove air. Keep the upper level of the acid exactly at the 0.00cm3 level without parallax error. * Open the tap of the burette slowly so that the acid drips into the conical flask * Observe the conical flask constantly while stirring and observe the colour change (changes from pink to colourless) * Towards the end point add acid slowly drop by drop until a single drop makes the alkali completely colourless * Repeat the titration until concordant results ( within � 0.05 cm3) are obtained * Record the initial reading and final reading for each titration and the titration volume is derived Results: An example of burette readings is given below: Burette reading 1 2 3 4 Final volume ( cm3) ...read more.

Conclusion

0.05 cm3 2. There may be zero error for the weighing balance. 3. The perfect verticality of the burette may not be assured 4. The first appearance of the colorless mixture may be missed during the titration. The assessment of the exact colour of the mixture may be hindered by poor or artificial light. Hazards and Safety Hazard Effect Precaution/ prevention Emergency treatment Spillage of the acid or alkali on the skin Corrosive 1.Handle the solutions with great care 2. Wear lab coat and gloves all the time 1. Irrigation of the affected area with plenty of cold water Spillage of alkali on the mucous membrane of mouth while pipetting corrosive Avoid using mouth to fill the pipette. Use filler Gargle with cold water. Seek medical help Inhalation of fumes of the acid or alkali Injury to respiratory tract Avoid inhalation Seek urgent medical help Fumes in the eyes Injury to eye Use goggles all the time Irrigation of eyes with cold water in plenty. Seek medical help if irritation or redness persists. Large spillage of acid or alkali on the floor Damage to floor Careful handling of the equipment Dilute the acid or alkali with plenty of water and mop later. ******************************************** ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous 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 GCSE Aqueous Chemistry essays

  1. The Formula of Succinic Acid

    n = 1 26 x 0.05 = 1.3g n = 4 36.5 x 0.05 = 1.8205g So the range I can work with to weigh out the anhydrous succinic acid is from 1.3g to 1.82g,which will make a 0.05M solution in 250cm3.

  2. The Use of Volumetric Flask, Burette and Pipette in Determining the Concentration of NaOH ...

    Excess gastric acid in the stomach, acid indigestion, is typically neutralized by the ingestion of sodium bicarbonate (NaHCO3) or other neutralizing agent (antacids). Phenolphthalein phenophthalein structure Phenolphthalein is a sensitive pH indicator with the formula C20H14O4. Often used in titrations, it turns from colorless in acidic solutions to pink in

  1. The Use of Volumetric Flask, Burette and Pipette in Determining the Concentration of NaOH ...

    Through careful control of the stopcock and rinsing, even partial drops of liquid can be added to the receiving flask. Before titrating, condition the burette with titrant solution and check that the burette is flowing freely. To condition a piece of glassware, rinse it so that all surfaces are coated with solution, then drain.

  2. 'The Molecular Formula of Succinic Acid'.

    n = 4 146 = 36.5g 4 I also want to make the solution to 0.05M because of the ratio 2:1, so therefore I need to multiply each weight by 0.05. n = 1 26 x 0.05 = 1.3g n = 4 36.5 x 0.05 = 1.8205g So the range

  1. Investigating Membrane Permeability.

    Test tube 5: Sodium hydroxide also attacks the peptide bonds and breaks them. However this solution has another affect. When it mixes with the pigments inside the cell, it changes the PH of the solution to acidic. This is clear because the colour of the solution is changed to yellow.

  2. In order for me to obtain the value of 'n' in the formula: ...

    When all of the solid pieces are dissolved rinse the stirring rod with distilled water so as to wash away any of the mixture of the solid on the rod into the solution. * I would then pour the liquid into a volumetric flask, ensuring that I don't spill any

  1. The aim of the experiment is to find the relative formula mass of an ...

    The care must be also taken while using phenolphthalein indicator. Its pH value is 9.5 which mean it is an alkali. This chemical also may cause damage to your body. During the experiment, if any of these chemicals affects part of your body immediately wash it with water.

  2. The The Molecular Formula of Succinic acid

    What mass of acid is required to achieve this concentration? n = c � v which is 0.1 � 0.25 = 0.025 moles The mass of 0.025 moles = n � Mr which is 0.025 � 132 = 3.3g This is obviously not an accurate mass as I do not

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