Titration Cw
Titration Coursework
Titration
Titration is an analytical process to find the concentration of a sample. It will be a quantitative process. One solution of a known concentration is placed in a burette and the other solution (the unknown) goes into a flask beneath the burette. You use the information gained from the experiment to analyse the concentration of the unknown substance.
Apparatus
Weighing boat
Glass rod
250cm3 conical flask
250cm3volumetric flask
Burette
100cm3 beaker x3
25cm3 bulb pipette
Basic pipette
Pipette filler
Small filter funnel x2
One balance (2.dp)
Wash bottle with distilled water
Clamp stand
White tile
Equation
Sodium carbonate + sulfuric acid '' potassium sulphate + carbon dioxide + water
Na2CO3(aq) + H2SO4(aq) '' K2SO4(aq) + CO2(g) + H2O(l)
Type of indicator to be used
An indicator is a substance that is one colour in an acid, and another colour in an alkali. To find an indicator suitable for this titration, it must change its colour over the range of pH where the titration curve is steep. There is a strong acid, and a weak base, so the indicator must lie between around pH 3 and pH 7. Methyl Orange changes colour between 3.2 ' 4.4 pH so this is ideal for the titration as the indicators range is inside the range of the main reaction.
Chemical Hazards
Sodium carbonate is irritant above the concentration 1.8 moldm-3, but as we are using a 0.1 moldm-3 concentration so it will not be a dangerous chemical. However sulfuric acid is corrosive when stronger than 1.5 moldm-3, however as we do not know yet the concentration of this chemical, it is advisable to wear a lab coat to stop it spilling on skin; goggles are also a necessary precaution to stop it making contact with your eyes. The indicator Methyl Orange is relatively harmless, but it is advisable not to spill on skin as it stains.
Method
To make the standard solution concentration for Na2CO3(aq) at a concentration of 0.10 moldm-3:
1. We...
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