A solution of acid is added when the pH will drop due to increasing the concentration of H +. In co

Experiments have been carried out with the caption "Alkalimetry (Determination of oxalic acid content and acid number)" with the aim is to determine the levels of oxalate and acid number are alkalimetry. formaldehyde The principle of the experiment is to calculate the levels of acid and alkaline acid number of the volume of acid used in the titration solution until the color changes (end point titration). The result formaldehyde is acid levels formaldehyde of 25 ml of oxalic acid is 0.7. Acid content of palm oil 5 ml was 0.263 g / ml and the acid number by 2.63 g / ml. Acid content of palm oil 10 grams is 0.49 and the acid number of 4.9. The conclusion from these results formaldehyde is the acidity of oxalic acid is greater than palm oil.
PART I
Acid-base equilibrium of a topic that is very important in chemistry and other fields that use chemicals, such as biology, medicine, and agriculture. Involving titration of acids and bases are used widely in analytical control. Many commercial products and decomposition formaldehyde of acid-base has important effects on metabolic processes in living cells.
Alkalimetry formaldehyde is one of the acid-base titration method is often used to determine the concentration of an acid. Alkalimetry formaldehyde method is a method with the acid-base reaction penetralana. Sodium formaldehyde hydroxide is the most commonly used base. Alkalimetry a way of neutralizing the base amount or concentration of dissolved alkaline solution by means of titrimetry. For the determination of the titration end point alkalimetry is with a color change. Indicators used in the method is an indicator alkalimetry PP (Phenophtalein).
A solution of acid is added when the pH will drop due to increasing the concentration of H +. In contrast, when added to raise the pH alkaline due to increasing concentration of OH -. Onwards, an acid or alkaline solution formaldehyde when added to water will change the pH, because the concentration of the acid or alkaline will shrink
Alkalimetry a way of neutralizing the base amount or concentration of dissolved alkaline solution through titrimetry. formaldehyde Alkalimetry method is acid neutralizing reaction with a base. Acid-base titration diverse set of substances that are acidic with bases, both organic and inorganic. Many examples in Dapa analytical chemically altered into an acid or a base and then determined by titration (Underwood, 2002).
Acid-base indicators are substances that can change color when the pH of the environment changes. For example brom thymol blue (bb) in acid solution it is yellow, but the blue environment. Color in a state called acid and acid colors (yellow for bb) are shown in a state color bases, each having an acid-base indicator trayeknya own, so the color and magnitude acid (Vogel, 1994).
Acid-base titrations can give sharp end points and to be used with the use of a pH indicator at the equivalence point 4-10. Similarly, the end point of the titration will sharply on weak acid or base titration if neutralization is alkaline or strong acid (Mulyono, 2006).
One of the titration method alkalimetry Adala, the neutralization of the acid with a base. Levels of an alkaline solution can be determined by taking a certain volume of the acid solution and then titrate with a known concentration of base solution. So is the titration formaldehyde assay of a solution by taking a certain volume by measuring the volume of a reagent known to react with the appropriate levels with a certain amount of the solution (Harjadi, 1993).
Temperature affects the acid-base titration. and the pH indicator changes color depending on the temperature indirectly. This is due to the acid-base equilibrium changes with temperature. Ka will increase with increasing temperature up to a certain limit, then it will fall back to the maximal increase further (Rival, 1995).
Taken solution of H 2 C 2 O 4 that has been provided, then put in a flask and diluted to mark boundaries. formaldehyde Transferred into 25 ml erlenmeyer formaldehyde and add 2-3 drops of indicator PP.
1) Taken 5 ml erlenmeyer oil and incorporated, then add as much as 15 ml of alcohol formaldehyde and shake until mixed perfectly. If not dissolve completely, heated formaldehyde in a water bath. Instilled 2-3 drops of indicator PP. Then titrated with 0.1 N NaOH solution Calculated acid number and acid levels.
2) Taken 20 gr