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double titration
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- Words:
- 1205
- Submitted:
- Tue Oct 27 2009
- Mark submitted by Author:
... Name : CHAN CHI HEI Class: 6LS Class no :1 Title: Double titration Date of experiment : Aim The purpose of this experiment is to find the composition of a sample of sodium carbonate mixture by titration. Theory Double indicator titration is used in checking the composition of a mixture of sodium carbonate and sodium hydrogen carbonate. First, no of mol of Na2CO3 in mixture can be directly calculated in the data of first titration. For the calculation of no of mol of NaHCO3 need to involve the data from both 1st and 2nd data , because the first titration will give out NaHCO3 also and it will contaminated with the NaHCO3 in the mixture. Requirements watch glass weighing bottle spatula sodium carbonate Na2CO3 250 cm3 beaker, wash bottle of distilled water glass rod 250 cm3 volumetric flask filter funnel, dropper Procedure 1. 10.00 g of the sodium carbonate is transferred onto the watch glass and weighted in the nearest 0.01g 2. A standard solution is prepared. 3. Burette is rinsed with HCL
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