Chemistrt Lab Report Sample

Chemistrt Lab Report Paper The determination of water hardness is a useful est.. That provides a measure of the quality of water for household and industrial uses. Hard water has no obvious health effects, but these ions form insoluble compounds with soap. Results are unsightly scum on clothing and so-called bath-tub ring. Water hardness is important to industry because hard water, upon being heated, precipitates Cacao, which then clogs boilers and pipes. It results in the equipment malfunction or damage and expensive cleaning. Elimination of water hardness is referred to as water softening. Hardness due to bicarbonate (HOCK-) can be eliminated by boiling, to expel CO. Thus, carbonate hardness is classified as temporary hardness. Hardness arising due to the presence of Ca+, MGM+, Fee+, and SASS-, cannot be eliminated in the same way as temporary hardness. Water containing these ions is said to be permanently hard. Permanent hardness is usually determined by titration with a standard solution of ethylene damming attracted acid, EDIT. EDIT is a aligned that has more than one point of attachment and complexes most metal ions in aqueous solution. It is weak acid that loses protons. They react in 1:1 ratio, so the titration reach the end point when all the metal ions reacted. Ricochet Black-T (Erie-T) indicator will be used, since both DE TA and Ca+2 colorless. This is a molecule that has a color change from pink, corresponding to Ca -calico complex, to blue corresponding to uncompleted indicator. Methods A 50 ml burette was rinsed with few ml of EDIT solution, and filled with prepared EDIT solution. We will write a custom essay sample on Chemistrt Lab Report specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Chemistrt Lab Report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Chemistrt Lab Report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Then 25 ml of distilled water and 5 ml of the pH 10 buffer were added to 250 ml Erlenmeyer flask. 5 drops of indicator and 15 drops 0. 03 M Magic were added to the flask step by step. Color changes were recorded. The solution was titrated against EDIT to determine a blank. Then sample of water was analyzed for its hardness. Above procedure was repeated using sample water instead of distilled water. Results We could determine blank titrating prepared solution against 1. 5 ml of EDIT solution. Throughout titration color changed from red wine to blue. However experiment part determining hardness of sample water failed, no end point was determined. We used up to 100 ml of EDIT solution for titration and no effect, while only few drops should be enough. Discussion could not find actual reason of failing this lab. There should be no problem with indicator or other part of the practical, since we got reliable results with the blank elution. The problem may be in the heating part of preparation of unknowns, which was prepared by instructor or TASK. We heat the water to make sure all the calcium ions and other metal ions are dissolved in the water. If they are not dissolved in the water, the indicator cannot form a complex with them and your end point will not be the true end point of the titration. This answer to the problem sounds legit to me. Conclusion We could not get useful knowledge from this experiment, since we did not succeed in the practical, and no calculations was done based on results. However, we should learn to analyze what was done wrong.