Assessed Practical
To determine the concentration of a limewater solution.
Aim:
The aim of this experiment is to determine the concentration of a limewater solution by method of titration.
Ca(OH)2 (aq) + 2HCl (aq) CaCl2 (aq) + 2H2O (l)
The calculation below is to determine the dilution factor and the volume of HCl needed for this titration.
Moles of Ca(OH)2 = Mass / Mr
1 / 40.1 + (16 x 2) + (1 x 2)
1 / 74
0.013513513 moles
Concentration of Ca(OH)2 = N / V
- / 1
0.01 moldm -3
Moles = C x V
0.013513513 x (25/1000)
0.0003378moles
Ratio:
HCl : Ca(OH)2
2 : 1
0.000676 : 0.0003378
Moles of HCl = moles of Ca(OH)2 x 2
V = N / C
0.00674 / 2
Volume of 2HCl = 0.000337 dm³ = 0.337cm3