Titration And Colorimetry To Determine The Concentration Of Solutions

To undertake titration and colorimetry to determine the concentration of solutions

By carrying out titrations and colorimetry, the aim of this investigations was to use these methods such that the concentrations of different solutions used can be identified, and to help find the concentration of the unknown solution that were given. Using Titration and colorimetry the concentrations of different solutions in general can be determined and this helps to identify solutions with unknown concentrations. In this assignment I was asked to carry out two different scientific techniques and find the concentration of different solutions.

Titration of sodium carbonate and sodium hydroxide

I was asked to find the concentration of a solution of sodium

The equipment I had to calibrate was a pipette, top pan balance and a pH meter. Calibration is a marking a scale on a measuring instrument. This involves establishing the relationship between indications of a measuring instrument and standard or reference quantity values, which must be applied. Calibration is important when conducting an experiment. For example, broken or wrongly calibrated pH meters can give incorrect results, making the results useless. In a research laboratory this could lead to wrong conclusions, wasted time and wasted

Its concentration is usually given in mol dm-3. A standard solution is created using a powdered form of the substance and dissolving it in distilled water to make a solution where you know the concentration. When making up a standard solution it is important that the correct mass of substance is accurately measured. It is also important that all of it is transferred to the volumetric flask used to make up the solution. The following procedure will make sure that this happens. Using these solutions will contain accurate concentrations of a chemical component, they will increase confidence regarding the determination of substances with unknown concentrations.

Colorimeter to determine the concentration of two unknown solutions

A colorimeter is a device used to test the concentration of a solution by measuring its absorbance of a specific wavelength of light. It can be used for coloured solutions of different concentrations. Before it can be used I had to calibrate the colorimeter. To do this I had to calibrate a colorimeter a cuvette filled with distilled water is placed into the colorimeter, the colorimeter in theory should then give a reading of the absorbance level being 0, this is because the water used in the calibration process is distilled and therefore should give a reading of 0, if not then it shows the equipment being used the experiment is either faulty or inaccurate. As all the light will pass