TITRATION

Titration IS a method to determine levels of a substance with the use of other substances that have been dikethaui concentration. Titration is usually distinguished by the type of reactions involved in the process of titration, for example when melibatan acid-base reaction is called as acid-base titration, redox titration to titration involving oxidation reduction reaction, titration titrations melibatan kompleksometri for complex formation reactions and so forth. (Here only discuss about the acid-base titration) Substances that will be determined measure referred to as "titrant" and usually placed in the Erlenmeyer, while the concentration of substances known as "titer" and usually placed in the "burette". Both the titer and titrant is usually a solution. Principles of Acid-base Titration Acid-base titrations involving acid or base as a titer or titrant. Acid-base titration based on the neutralization reaction. Levels of acid solution is determined by using a base solution and vice versa. Titrant added titer gradually until it reaches a state equivalent (meaning that the exact stoichiometric titrant and titer discharged react). This situation is referred to as the "equivalent point". At this point ekuivalent the titration process was stopped, then we record the titer volume needed to reach that state. By using data titrant volume, the volume and concentration of titer then we can calculate the levels of titrant. Knowing How to Spot Equivalent There are two common ways to determine the equivalent point in acid-base titration. 1. Using a pH meter to monitor pH changes during titration done, then make a plot between pH and titrant volume to obtain the titration curve. Middle point of the titration curve is "ekuivalent point." 2. Using acid-base indicator. Indicators added to the titrant before the titration performed. This indicator will change color when the equivalent point occurs, at this moment we stop titration. n general, the second way was chosen due to ease of observation, no additional equipment required, and very practical. The indicator used in acid-base titration is a perbahan color indicator is influenced by pH. The addition of indicators sought as little as possible and generally is two to three drops. To obtain the accuracy of the titration, the titration end point is selected as close as possible to the equivalent point, this can be done by selecting the appropriate indicators and in accordance with the titration to be performed. Circumstances where the titration was stopped by to see the color change indicator is called the "end point titration." General formula Titration At the time point equivalent to the mole-ekuivalent acid will be equal to mole-ekuivalent base, then this can be written as follows: mole-equivalent of acid = moles of base-equivalent Mole-equivalent obtained by multiplying the volume of normality with the formula above we can write as: NxV NxV acid = base Normality obtained by multiplying the molarity (M) by the number of H + ions in the acid or the amount of OH ions on the bases, so the formula above becomes: nxMxV nxVxM acid = base description: N = normality V = Volume M = Molarity n = number of ions H + (in acid) or OH - (at base) You can use the formula above if you are an all matters involving the titration.

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Judul: TITRATION
Ditulis oleh : Indonesia Documents Group
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