Buiret pHReading Buiret pHReading
0 6.1910 4.7511.40 10.2620.90 5.4020.18 5.9510 3.5011.40 3.8020.90 4.5520.6820.48 3.80Total V:10 mL1.40 mL9.5 mL.22 mL.20 mLVI. A.The sample with the highest alkalinity is Na2CO3(aq) because it accepted the most HCl (aq) and therefore the most protons. The alkalinity descends when moving right on the chart above. Water and Na2SO4(aq) have almost no alkalinitybecause they did not need more than .22 mL of HCl(aq) to be fully titrated. B. - C.From internet research: normality HCl (aq)= 1 N x .02 = .02N10 mL HCl (.02N) (50,000 mg CaCO3equiv.)= 200.0 mg/L CaCO350.00 mL Na2CO3ConclusionWater hardness is synonymous with alkalinity. A substance that is alkaline exhibits the behaviour of a Bronsted-Lowry base by accepting protons. We can measure the hardness of a water by titrating it with EDTA. We can measure the alkalinity of a water by titrating it with a proton donor, an acid. One source of error in this experiment may have been that the pH probe was not fully rinsed before starting a trial with another substance. Another source of error is perhaps improper biuret preparation.
- Spring '16
- Christine Gaudinski
- Chemistry, ml