This website uses cookies to ensure you have the best experience. Learn more

Titration Lab Report

1207 words - 5 pages

Lab Report 2 – Titration
CHEM1903 – Chemistry 1A (SSP) Michael West (305159240)

1. Experiment 2.2 – Titrimetric determination of the molecular mass of an organic acid
Method An unknown organic acid was supplied in solid form. The acid was known to be diprotic and had the reference number 19. Using an analytical balance, 1.5397 g of the acid were weighed out, and made up with deionised water into 250 mL of solution. 25 mL of the acid solution was added to a conical flask with phenolphthalein indicator and titrated against standardized 0.0983 M NaOH solution. Three titrations were performed and the results averaged. The molar mass of the acid was then calculated and compared to a list of ...view middle of the document...

Volume (mL) Titration 2 Titration 3 0.00 0.00 18.00 47.95 29.95 18.10 48.25 30.15

Point Origin Phenolphthalein endpoint (volume of titre A) Methyl orange endpoint Volume of titre B

Titration 1 0.00 17.85 47.60 29.75

Mean n/a 17.98 n/a 29.95

The titrations were not exactly reproducible, with the volume of both titre 1 and titre 2 increasing from titration 1 to titration 3. This might be because the titrations were not performed simultaneously, with the soda water aliquots of titrations 2 and 3 allowed to stand exposed to the atmosphere while titration 1 was being carried out. As it warmed, this soda water would have undergone degassing, with HCO3- and H2CO3 being converted to gaseous CO2, released to the atmosphere. Thus, less NaOH reacted with the later aliquots, and more was left to react with the HCl, so the titres of HCl were larger.

Equilibria between carbonic acid, hydrogen carbonate and carbon dioxide, and ions in water:

Titration of HCl with NaOH:

If the density of water at 20°C is 0.998 g/mL, then the solubility of CO2 in water at 20°C of 0.145 g/100 g is equivalent to . The molar mass of CO2 is . .

Hence, the concentration of the gas at saturation is

As a check, we can derive a similar result using Henry’s Law for the concentration of gases in solution. Details of this are given in an appendix, with the result of matching the above result to only 1 significant figure, but at least giving confirmation of the order of magnitude. The numbers for saturation point are hence much lower than the experimentally determined concentration of CO2 in the soda water, . Since the experimental concentration was determined after the cap was taken off, we conclude that even with the cap off, the soda water was still super-saturated in CO2 (at least initially; over time, degassing will cause the soda water to become unsaturated). Before the cap was removed and any degassing occurred, the concentration must have been higher, so it would also have been super-saturated then. Two key general principles are operating. The first is related to Henry’s Law, . As mentioned, more details are available in the appendix, but we note that concentration of CO2 in the aqueous phase is directly proportional to the partial pressure of CO2 in the gaseous phase above the liquid, . Hence, when the seal is broken and the pressure drops, the concentration of aqueous CO2 falls as it is released to the...

Other Essays Like Titration Lab Report

The Versatility And Flexibility Of OLED's

1014 words - 5 pages unit. This makes OLEDs specific to certain substances but given their size and ease of use, the specificity is negligible. (Freudenrich). One of the biggest advantages of OLEDs is that they give an immediate response and do not need to be shipped to a lab for analysis. This property can make OLEDs useful as dosimeters, which measure exposure to something in the environment — usually to a hazard that could inflict a cumulative impact over long

Comparing The Moral Virtues Of Antony And Julian The Apostate

1103 words - 5 pages Roman emperor Julian the Apostate and Christian leader Antony both exhibited many qualities of character during their existence. Both of them led very distinctive lives although shared several ethical values. Book 25 of “The Later Roman Empire” and the book “Early Christian Lives” show concrete evidence of this. In the following essay, I will argue how both leaders’ lives were devoted to their religious beliefs and their mutual cardinal virtues

Living In A Cashless Society

1637 words - 7 pages Money in a traditional sense no longer exists. Money is becoming much of a concept than a physical material, and most ordinary bitter have not see the reality of the switch. People today are using credit and debit cards on a regular basis and in everyday situations such as meal purchased at fast food, highway tolls, clothing, groceries, gas stations, etc. all of these means of systems could be regarded as a cashless society or world. The question

The French And Indian War: The "Real" First World War

1955 words - 8 pages The Seven Years War, or more commonly referred to as “The French and Indian War”, has been called the true First World War. In this book The French and Indian War: Deciding the Fate of North America, the author and historian Walter R. Borneman paints a detailed and elaborate picture that justifies the claim of it being the first true war of global proportions. If ever there truly was a climax to the never ending feud of the European powers

Is The Use Of Animals In Medical Research A Necessary Measure?

1513 words - 7 pages Throughout history, animals have been used in experiments to test product safety and obtain medical knowledge that benefits both humans and animals alike. Every year there are numerous medical breakthroughs, such as medications and surgical instruments, which are tested on animals to insure their safety before they are deemed acceptable for human use. Even though the results of the experiments saved millions of human lives, they are also

Education And The Evolving Job Market

2363 words - 10 pages The lives of students today are changing. They are preparing for lives and jobs that have never before existed. If teachers hope to have a significant and worthwhile impact on these quickly changing lives, they must change the way they think, prepare, and instruct our future generations. Children cannot afford to have teachers who remain stagnant in their methods and ideals. Students crave instructors that are willing to allow them to tap

Young And Relentless

1737 words - 7 pages There are numerous influences that can be responsible of teenager’s behaviors and attitude as they develop. One factor that is important to these behaviors is parental figures being over involved or uninvolved in their children’s lives. Many of these effects include illegal substance abuse, rising sexual activity, underage alcohol consumption, and tobacco use. Studies show parental participation plays a key role in the characteristics developed

The Natural Law Theory

1231 words - 5 pages Obeying by the natural law theory is the only true and moral way to live life; especially a life lived in God’s image. God’s presence is a guiding factor to obtaining a moral and virtuous life, which can only be obtained by following the natural law theory. God created a set of laws as a supreme guide for humans to live life, like any law these laws were created to ensure wellbeing for everyone. The laws he created are the civil law, the natural

Resolved: Presidential Signing Statements Threaten To Undermine The Rule Of Law And The Separation Of Powers

1811 words - 8 pages with controversy, during the Bush administration (Ellis & Nelson, 2010). In 2006, a report by the American Bar Association, one that had been ordered by the GAO in response to President Bush’s apparent misuse of signing statements, condemned the use of this executive instrument. This report pushed the President to veto bills that he or she did not entirely agree with, rather than implement a signing statement. In addition, the ABA called for

Oppressive Systems Of Government In Egypt And Animal Farm

1529 words - 7 pages As in Egypt, Orwell demonstrates through his allegorical novel “Animal Farm” that leaders are able to establish and maintain power over a people, and in turn create an oppressive and corrupt government system. Orwell shows the significant difference in the education and levels of knowledge in the animals, and how the government takes advantage of this difference. The split between the levels of intelligence is portrayed in the first chapter when

The Pathway To Psychosis

1415 words - 6 pages and 2346 women). These subjects were a random sample of “military conscripts” (Rossler, et al., 2011, p. 13). It is important to note that at the time of this study in Switzerland all male citizens were ordered to present themselves for “military conscription” (Rossler, et al., 2011, p. 13). All subjects filled out a self-report questionnaire of 90 questions covering a wide variety of psychiatric symptoms (as well as a range of

Related Papers

I Dont Konw Essay

981 words - 4 pages titrations with distilled water. TREATMENT OF DATA: 1. Calculate and report the percent of iodide and chloride in your sample (calculated for the dry sample). Include the error, based on the three repetitions. 2. Calculate the ratio of Ksp of AgI and AgCl from the measured potentials of the titration curve equivalence points. PRE-LAB PROBLEMS: (1) Give a chemical reason why a saturated calomel reference electrode is not placed in direct contact

Find The Concentration Of Ethathoic Acid In Consumer Grade Vinegar

3560 words - 15 pages Chemistry Lab Report Aim: Find the concentration of ethathoic acid in consumer-grade vinegar Submitted by: Abhijat Verma Class: 2IBC Abhijat Verma 2IBC Introduction The main essence of a titration is neutralisation reactions. These occur usually between acids and alkalis. The result of them is, in most cases, a salt and water. When the correct amounts of each have been reacted in a special titration setup in the correct amounts, they


3040 words - 13 pages for USDA certified edible animal fats, such as tallow or lard. However, the feed industry also uses PV to assess the stability or rancidity of fats used as feed ingredients, by measuring lipid peroxides and hydroperoxides formed during the initial stages of oxidation. Values are reported as meq of peroxide per kg of fat. It should be noted that difficulties in the titration end point are common for low PV levels, which may account for a portion

The Separation Of Capital Ownership And Control

1577 words - 7 pages The argument of whether the separation of capital ownership and control is an efficient form of organization has constantly been a controversial issue. The criticism whether the controllers’ act is in the best interest of the owners’ wills never end as long as hired managers operate management. As the number of public companies has been increasing over the course of this century, meanwhile the American style of contact based corporation has