Chemistry Report

Topics: Titration, Sodium hydroxide, Acid Pages: 5 (1889 words) Published: August 19, 2013
The Titration of a Basic Solution of Unknown Molarity with a Standard Hydrochloric Acid Solution

Abstract
The aim of the experiment was how to determine the molarity of a solution. My hypothesis was if I have to determine the molarity of a NaOH solution, then I would have to use a standard solution of HCl solution because I would need to neutralize each other to determine the concentration of the solution of NaOH. The method that I used for this experiment was titration. Titration helped me achieved the result on figuring out the unknown molarity of the solution. Throughout the experiment, I obtained the result of each volume in each trial that was used in. With the result that I obtained, I was able to figure out the unknown molarity of the solution. Finally, I concluded that titration does help to determine the unknown molarity of a solution.

Introduction
Titration is a technique used by scientists to determine the molarity of a solution. It is being done when a solution of one known reactant, called titrant, is being added to the other reactant, which its concentration is unknown. When a change of color occurs, it means that neutralization has been reached. Titration is used to determine the molarity of acids or bases with its standard solution, which its concentration is known. An acid is a substance which has the H+ ion as the only positive ion in solution. It is also considered as the H+ donor. A base is a substance that produces an OH- ion as the only negative ion in aqueous solution. It’s considered as the H+ acceptor.

The purpose of using a titration is to find the concentration of either an acid or base from another concentration of either an acid or base that is known. When adding either an acid or base, it would be neutralized at some point in which then, the titration formula would be used to find the concentration of the solution. One example on using titration is NaOH and HCl. NaOH is a base whereas HCl is an acid. If the concentration of HCl is known and the concentration of NaOH is unknown, we add NaOH to HCl to figure out the molarity of NaOH along with an indicator. When the color changes in the indicator, it means that neutralization has reached and we figure out the volume that is used for NaOH.

Titration is being used in many researches or in real life. For example, it could be used as for pregnancy test. Urine is being added into a test strip or solution and when a color changes, it will indicate either a positive or negative test result. Another example with pregnancy is with the present of blood that could be performed by a health care provider. [2] Titration could be used as to measure the amount of glucose in one’s blood by using a blood glucose meter. It is worked by adding a sample of blood into a test strip and mixed with a reactant in which then the result could be provided.

Endpoint and equivalence point are both two different things. Equivalence point is the ideal point for the completion of titration. [5] To get a good result of the unknown concentration, it must be added very slowly. Endpoint indicates when the equivalence point has been reached in which an indicator is being used to obtain the result. An indicator helps to change color within the substance to figure out when the reaction is complete. The indicator used for obtaining the result of this experiment is phenolphthalein. Phenolphthalein is used because it has two chemical forms in which when acidic, it is colorless and when base, it is read or pink. [7]

The equation when using titration is MaVa = MbVb. ‘M’ is the molarity of either the acid, which is ‘a,’ or the base, which is ‘b.’ ‘V’ is the volume of the solution. To determine the molarity of the base, the titration equation is used. Since the molarity of the acid is known, and the volume of the acid and base is determined during the experiment, substitute the molarity of the acid and the volume of both acid and base. Then, solve the equation for Mb...
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