CHM256 VIDEO PRESENTATION (Determined Acidity In Soft Drinks)

[00:00:10]Have you ever wondered why soft drinks t sour? That sour taste comes from acid such as citric acid or phosphoric acid.

[00:00:21]Today I will show you how we can measure that acidity using simple technique called volutric analysis. The acidity of soft drinks can be determined using voluupometric analysis, specifically an acidbased titration. In this method, the acids in the soft drinks react with a standard sodium hydroxide solution until the end point is reached. Phenylene is used as the indicator to detect the end point by changing from colorless to pale pink. The volume of NaOH required is used to calculate the total titratable acidity of the soft drink. Hello everyone, I'm Shazwan and now I will explain the theory behind the volumetric analysis and how it used to determine the acidity of soft drinks. First, what is volutric analysis? So volutric analysis also known as titration is a quantitative analytical technique used to determine the concentration of a known solution by reacting it with a standard solution of known concentration.

[00:01:35]The amount of a standard solution called the titrate that is needed to completely react with this sample is measured accurately. This measure volume allowed us to calculate the concentration of the acid present in the soft drinks. In this application, we use an acid based titration because soft drinks contain acidic compounds. The most common acids found in soft drinks are carbonic acid which is formed from diss of carbon dioxide, citric acid which is commonly found in fruit flavored drinks and phosphoric acid which is mainly present in cola beverage. During the titration, this acid react with a standard sodium hydroxide or no solution. The neutralization reaction can be generally represented as acid base into salt plus water. The reaction continues until all of the acid has been neutralized by the sodium hydroxide. To identify the end points of the saturation, phenylthylene is used as the indicator. It is colorless in acidic solutions but it change to faint pink color when the solution become slightly alkaline. This permanent pale pink color indicate that the neutralization reaction is complete.

[00:02:56]In this slide, the concentration of acid is then calculated using the dydration equation. M_sub_1 v_sub_1 is equal to m_sub_2 v2 where m_sub_1 and v1 represent the concentration and volume of acid sample while m_sub_2 and v2 represent the concentration and volume of the sodium hydroxide news.

[00:03:17]Determining the acidity of soft drinks is important because it helps manufacturers maintain consistent product quality and test ensures compliance with food quality standard and allows consumer to understand the acidity level of the beverage they consume. With this understanding of the theory, we can now move on to the experimental methodology used to determine the acidity of a soft drink.

[00:03:43]Next, I will explain the methodology used to determine the acidity of soft drinks. First, 25 ml of the soft drink was measured accurately using a pipet and transfer into a conical flask. Then, two to three drops of phenopylene indicator were added. Since the soft drink is acidic, the solution remained colorless. Next, the bureete was filled with a standard sodium hydroxide solution. The soft drink was then titrated by adding NaOH slowly while continuously swirling the flask to ensure proper mixing. The titration was stopped when a permanent pale pink color appeared and remained for about 30 seconds. This indicates the end point meaning the acid in the soft drink has been completely neutralized by the NaOH.

[00:04:44]After that the initial and final bure readings were recorded to determine the volume of NaOH used. The titration was repeated until three core cordodent title values were obtained to improve the accuracy and relability of the results.

[00:05:04]Finally, the average titro was calculated and used with the neutralization equation to determine the total acidity of the soft drink. The principle of this experiment is acidbased titration which is a type of volutric analysis.

[00:05:24]The principle of this experiment is acidbased titration which is a type of volutric analysis. Phenofylene was used as the indicator and the end point was identified by the permanent pale pink color. The purpose of this method is to determine the total acidity of the Now I will be present the example of the result obtained from the volutric analysis. This table show the titration result for three trials. For each trial its initial and final B reading were recorded and the volume of sodium hydroxide used known as the tit value was calculated. The targeted value obtained are 12.40 ml, 1230 ml and 12.40 ml. Since this value are very close to each other, the result are considered consistent and realable. Next, the average tit was calculated by adding the three tit value and divided by three.

[00:06:17]The average title obtained to 12.40 ml.

[00:06:20]This average title is then used together with the balanced chemical equation and the non concentration of sodium hydrox to determine the acidity of the soft tricks. The consistent titrate value indicate that the titration was carried out where with good portion. A higher titrate value means that more sodium hydroxide is required to neutralize the acidic in the soft drink which indicate a higher acidity. Therefore, the calculation acidity can be used to compare different soft drink or to evalate the acidity content of the beverage. Thank you.

[00:06:55]I am Daniel Milan and I'll proceed with the conclusion.

[00:07:00]So to conclude, alometric analysis is an accurate and reliable method for determining the acidity of soft drinks.

[00:07:08]It is widely used in the food beverage industry for quality control ensuring that product have consistent acidity test and are safe for consumer. One of its main advantage is that it is accurate, cost effective and easy to perform using standard laboratory equipment. However, the method also has some limitation such as requiring careful endpoint detection and accurate preparation of standard solution to minimize error and overall volutric analysis remain an important analytical technique for maintaining the quality and safety of soft. That is all. Thank you.