Chemistry concentration of lime water.
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... lour of the solution is light, clear, orange and this should turn to pink by the end of the titration. In order to obtain consistent and reliable results it is necessary to repeat the experiment several times. After this it the results must be noted in a table as I have indicated in the table below. Titration 1 Titration 2 Titration 3 Final Reading 6.70 cm3 12.30 cm3 17.90 cm3 Initial Reading 1.00 cm3 6.70 cm3 12.30 cm3 Titre 5.70 cm3 5.60 cm3 5.60 cm3
Average titre 5.70cm3 + 5.60cm3 + 5.60cm3 = 5.63cm3 3
Conclusion Number of moles of HCl: 1dm3= 10*10*10cm3= 1000cm3 Number of moles= concentration * volume 0.10 mol dm? 3* 5.63cm3 = 5.63*10?@ mol 1000
Number of moles of Ca(OH)2 (Calcium hydroxide): Reacting ratio: 1 Ca(OH)2 : 2 Hcl 5.63*10¯@ mol = 2.82*10?@mol 2
Concentration of Limewater in mol dm?3: 25.0cm3 = 25.0 dm3 = 2.50*10?2 dm3 1000
2.82*10?@ mol dm?3 2.50*10?2 = 1.13*10?2 mol dm?3 Concentration of Limewater in g dm?3: Formula mass (Ca(OH)2)= 40.1+(16+1)*2 = 74.1g Concentr ...
