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

Preparation of ear drops practical. Titration of NaHCO3

Extracts from this document...


Preparation of ear drops practical Introduction Eardrops are preparations used for the treatment of various disorders of the ear. They come in numerous dosages and consist of many different ingredients depending on what they have been recommended for1. Over time the composition of eardrops have improved and been more tailor made to cover a large range of specific ear problems. The most common problem involving ears is earwax. Earwax is produced to keep the ear clean and to protect it from infections. Sometimes the production of it either becomes too much. These earwax problems can cause various conditions such as dizziness, hearing loss, irritability as well as loss of balance2. When eardrops are administered they break up large compacted pieces of earwax into smaller manageable clumps. ...read more.


Results The results obtained from the titration are as follows: Volume in cm3 Trial Titre 1 Titre 2 Titre 3 Titre 4 Initial volume 50 50 50 50 50 Final volume 12.50 19.50 19.40 19.50 19.20 Total amount used 37.50 30.50 30.60 30.50 30.80 From the results it can be clearly seen that the trial titration was overshot. The four titre results all fell within 0.30 cm3 of each over, showing accuracy. The average of the four titres came to be 30.60 cm3. To calculate the molarity of NaHCO3 Using the formula Moles= Concentration/Volume The concentration is given at 0.1 M and the volume obtained is 26.60 cm3. By rearranging this equation, molarity can be calculated: 0.1 x 30.6 = 5.005(being the weight) ...read more.


Another contributing factor wound be the use of a weighing boat, to say all of the powdered NaHCO3 was added to the beaker with no grains left in the dish would be incorrect as it is not easy to ensure that the entire 5.005 grams entered the beaker. These minor details may have contributed to difference seen in the calculation and the amount actually weighed. Not withstanding differences may be caused by the accuracy of an individual when looking at markings on lab equipment. Discussion The mixture used in this experiment is just one of many mixtures used to make eardrops. Different eardrops require different amounts of ingredients, that where titrations come into importance. Pharmacists use titrations to ensure that the amount they believe to be measuring is actually present. ...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. A comparison of various proprieary antacids

    Data Collection: Table 1: Showing the volumes of Sodium hydroxide base(0.5 M) needed to neutralize excess Hydrochloric acid(25 cm3, 0.5 M), after addition of 2 Actal Tums, for three trials. Trial Number 1 2 3 Final Volume of NaOH, cm3 �0.05 cm3 1.45 1.20 1.30 Initial Volume of NaOH, cm3

  2. To calculate the percentage composition of the mixture of Na2CO3 + ...

    The percentage composition of NaHCO3 can be calculated as follows - (0.602/0.837)*100 = 71.9 % Therefore, the percentage composition of Na2CO3 is 100 - 71.9 = 28.1 % Error propagation The absolute uncertainty of the masses was + 0.002g, Therefore the percentage uncertainties of the masses were calculated as follows - (0.002/0.602)

  1. Stoichiometry Lab Report. Aim: To determine what solid product is produced in the ...

    * You can keep the time controlled by either looking at the clock every couple of minutes or putting a timer to 10 minutes. * To keep the mass of the baking soda at 2.0 grams exactly, you have to weigh it very carefully each trial.

  2. Kinetics Practical

    You could also see the gradient Y=-0.54x+68.67, Time over temperature. Conclusion & Evaluation: After reviewing my hypothesis I concluded that my assumption was correct. Through knowledge gained from chemistry class I assumed that when we boil a substance or solution the particles move faster making the reaction rate increase.

  1. alkali titration

    amount of oxalic acid present = 0.00097 mols �1.23% 4. What amount of oxalic acid was present in your 250 cm3 volumetric flask? Concentration of acid in 250mL is the same as the concentration of acid in 1L. Therefore the concentration of acid in 1 dm-3 of acid solution is

  2. Chemical monitoring and management - composition of the atmosphere and the problems of pollution.

    The picture below shows a leaf discoloured by ozone molecules. 4. State the common name , correct iupac name and the correct formula of two cfcs Common name : Freon Iupac name : dichlorodifluoromethane Common name : HCFC-124 Iupac name: chlorotetrafluoroethane 5.

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