Name Experiment 12 Post laboratory Problems and Conclusions 1. Titrations are ve
ID: 1040477 • Letter: N
Question
Name Experiment 12 Post laboratory Problems and Conclusions 1. Titrations are very common in the determination of substances in s are the criteria for using titration analysis for a chemical reaction? 2. Explain why we used titration analysis for this reaction rather than the previous technique of gravimetric analysis (collection and weighing a solid product) 3. What is the purpose of the indicator in the reaction? 4. The end point of a titration is generally considered to be the stoichiometric equivalence point for the reaction. What error is inherent in this assumptionExplanation / Answer
the following criteria must be met for a titration to be successful.
1.) There must be a direct stoichiometric relationship between the reactive species such that no alternative or side-reactions occur.
The reaction should proceed rapidly. If the reaction is slow, than a greater amount of the titrant will be added resulting in inaccurate determination of the concentration.
The reaction must be quantitative. If the reaction goes to less than 100 % completion there will again be an incorrect determination of concentration.
There must be some method for observing the endpoint of the reaction.
2 . )
Gravimetric analysis is a type of quantitative analysis that depends on weighing. For example, the amount of lead in a solution of lead nitrate could be measured by adding excess hydrochloric acid to precipitate lead chloride, filtering the precipitate, washing, drying, and weighing.
A titration is a type of volumetric analysis in which the volume of one reagent, known as the titrant, is added to a known volume of another reagent slowly from a burette until an 'end point' is reached. The volume added before the end point is reached is noted. This method is used for calculating the concentration of an unknown solution. If one solution has a known concentration, then the other one can be calculated.
3.)
Indicators undergo a visible change as a result of reaction with excess titrant. This allows visual confirmation of whether a reaction has reached completion without requiring extra equipment like pH meters or conductivity meters.
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