Based on the experimental results it can be seen that there has been acid-base reaction between kcs

I. Purpose kcs Praktikan can understand and standardize the secondary kcs standard solution of NaOH with a primary standard solution of H 2 C 2 O 4 2H 2 O as much as 1.5753 g. Can make the process of titration and determine the actual concentration of NaOH.
Acid-base reaction is the reaction kcs that occurs between an acid solution kcs with an alkaline solution, the results of this reaction kcs can be called a neutral acid-base neutralization reaction also depends on the solution to be reacted. Reacted solution is one of them called the standard solution. Standard solution is a solution of known concentration to the right and can be used to determine the concentration of another solution. There are two standard solution is a solution of a primary standard and secondary standard solution.
In this experiment the solution used as a primary standard solution is H 2 C 2 O 4. 2H 2 O (oxalic acid). Oxalic acid is a solid, kcs smooth, white, well soluble in water. Oxalic acid is a divalent acid and the titration kcs is always to form normal salt. .berat equivalents of oxalic acid is 63.
Secondary kcs standard solution standard solution whose concentration is to be determined by titration against a primary kcs standard solution. In this experiment the solution used as a standard solution of NaOH sekundere is. NaOH solution belonging to the secondary kcs standard solution is alkaline. Sodium hydroxide (NaOH), also known as caustic soda, is a caustic kcs metallic base type. Sodium hydroxide to form a strong alkaline solution when dissolved in water. Sodium hydroxide is a white solid pure form and is available in the form of pellets, flakes, granules, or a solution of 50% saturated. NaOH is moist and liquid spontaneously absorb carbon dioxide from the air. He is very soluble in water and will release heat when dissolved. NaOH is also soluble in ethanol and methanol, although the solubility of NaOH in the second fluid is smaller than the solubility of KOH. NaOH insoluble in diethyl kcs ether and other non-polar solvents.
Solubility in water
As an acid-base indicator pointer acidity substance solubility is an organic kcs compound with a complex structure that changes color when the pH of the solution changes. Indicators can also be used to set the pH of a solution. Indicators are weak acids or weak bases that have color quite sharp, with just a few drops of dilute-dilute solution, the indicator can be used to establish the equivalence point in acid-base titration to determine the level of acidity or solution. In this experiment the indicators that will be used is an indicator phenolphtalein or often referred to as indicators of PP. PP has a color indicator colorless acid, the pH range of color change between 8.3 to 10.0 and a red base color.
ü Preparation of 0.1 N NaOH
- Do titration with 0.1 N NaOH solution until there is a constant color (by way of putting erlenmeyer under the burette, burette and open the faucet dripping 0.1 N NaOH solution into the Erlenmeyer flask containing a solution of H 2 C 2 O 4 2H 2 O, shaking Erlenmeyer)
BE
40
V 1 = volume = 10 ml oxalic acid
8.15 mL
In this experiment praktikan perform quantitative analysis to standardize secondary standard solution with primary standard solution. where in this experiment the secondary kcs standard solution to be used is NaOH (sodium hydroxide) and a primary standard solution of H 2 C 2 O 4 2H 2 O (oxalic acid).
Based on the experimental results it can be seen that there has been acid-base reaction between kcs oxalic acid (a weak acid) and NaOH (a strong base). In the manufacture of standard solution of sodium hydroxide used is fenophtalein indicator (indicator PP). Fenophtalein indicators used in this experiment because kcs fenophtalein colorless with a pH between kcs 8.3 to 10.0 will facilitate the practitioner in knowing that the process has reached the equivalence point. Changes that occur in this penitrasian process is transformed into a constant red color from the color of clear origin. This color change kcs occurs because the equivalence point has been achieved. The volume of NaOH required to titrate 8.15 mL, calculated as the average of five trials. And the determination of the concentration of NaOH normality of NaOH obtained kcs at 0.1227 N.
The conclusion after Melak