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

Conservation Of Mass Essay

5535 words - 23 pages


Mass conservation


The aim of this experiment is to show that mass is conserved during a chemical reaction.

The Law of Conservation of Mass, established in 1789 by French Chemist Antoine Lavoisier, states that mass is neither created nor destroyed in any ordinary chemical reaction. Or more simply, the mass of products by a chemical reaction is always equal to the mass of the reactants. (E, Durnford


The reaction between potassium iodide and lead (II) nitrate under room temperature and atmospheric pressure results with a yellow precipitate. This reaction can be expressed by the equation: 2KI(aq) + Pb(NO3)2(aq) PbI2(s) + 2KNO3(aq)


...view middle of the document...

Zero the balance and put both beakers together on the balance (balance is big enough for two beakers). Weigh their total mass accurately.

Record the mass obtained including uncertainties.

Carefully pour the lead (II) nitrate solution into the 100 mL beaker containing the potassium iodide.

Record the observation during the reaction.

Use a glass rod to carefully stir the mixture in order to make sure the reaction is completed. Re-zero the balance. Place both beakers back on balance and weigh their total mass.

Record the mass obtained including uncertainties.

When finished, pour the contents of the beakers into the laboratory sink.

Rinse the beakers and the measuring cylinders under tap water.

Dry the beakers and the measuring cylinders.

Repeat steps 2-12 another four times to maintain accurate results.



Lead nitrate is toxic and is categorised as possibly carcinogenic to humans. Potassium iodide is a mild irritant and may be harmful if swallowed and irritating if inhaled. Their product, lead (II) iodide may cause irritation if contacts with skin and eyes. Therefore safety glasses and apron should be worn all the time. Prevent as much ingestion, inhalation and skin contact with the chemicals as possible. Wash hands thoroughly after the practical to eliminate any chemical residue.


Beware of holding the beakers while putting them on the balance. Spillage of chemical could make contact with skin and burn the skin. All chemicals should be disposed by pouring them carefully into a sink after the experiment.


Basic treatment of chemical irritation involves by washing the chemical substance off the skin in order to prevent further contact with the offending chemical. If eye irritation occurs, immediate and thorough irrigation of the eye with tap water should be performed in order to prevent damage to the cornea. If a toxic chemical has been swallowed, immediately seek help by calling an ambulance and going to hospital.



Mass before weighing(�0.001g)

Weight after weighing(�0.001g)
















Qualitative data:

Yellow precipitate was produced.

There were some spillages of the product.

Processed data


Mass difference � 0.002g

Mass difference express as percentage

Random Error


























The mass of both the beakers and their contents before the reaction was not the same as the mass after the...

Other Essays On Conservation Of Mass

Architecture - What Makes A Buildling Green

4150 words - 17 pages building which has become more popular in the last 25 to 30 years. Also known as sustainable design, green architecture is a method of design that minimizes the impact of building on the environment. Once thought of as unconventional...Definition - a sustainable use of materials that do not destroy or pollute the environment, while providing better insulation and thermal mass than conventional building materials.The voluntary pursuit of any activity

Character In "The Yellow Wallpaper" By Charlotte Perkins Gilman

1587 words - 7 pages would not say it to a living soul, of course, but this is dead paper and a great relief to my mind-) perhaps that is one reason I do not get well faster. You see he does not believe I am sick!'(507) The men are under the impression that what they say goes and therefore the woman has no choice but to follow. 'He knows there is no reason to suffer and that satisfies him.'(508) This quote illustrates that the men are in control. If they strongly

Edgar Allen Poe's View Of Death In "The Fall Of The House Of Usher"

1836 words - 8 pages Edgar Allen Poe's Symbolism of Death in 'The Fall of the House of Usher'Death is defined as, 'The termination or extinction of something' (American Heritage Dictionary). Edgar Allen Poe uses this description in 'The Fall of the House of Usher' in different ways. Poe's intention when writing 'The Fall of the House of Usher' was not to present a moral, lesson, or truth to the reader; he was simply trying to bring forth a sense of terror to the

"Slaughterhouse Five" By Vonnegut

2264 words - 10 pages When one begins to analyze a military novel it is important to first look at the historical context in which the book was written. On the nights of February 13-14 in 1944 the city of Dresden, Germany was subjected to one of the worst air attacks in the history of man. By the end of the bombing 135,000 to 250,000 people had been killed by the combined forces of the United States and the United Kingdom. Dresden was different then Berlin or many of

Psychoanalysis And Freud

2420 words - 10 pages Psychoanalysis is a system of psychology originated by the Viennese physician Sigmund FREUD in the 1890's and then further developed by himself, his students, and other followers. It consists of three kinds of related activities: (1) a method for research into the human mind, especially inner experiences such as thoughts, feelings, emotions, fantasies, and dreams; (2) a systematic accumulation of a body of knowledge about the mind; and (3) a

Comparative Essay. "Heart Of Darkness" By Joseph Conrad And William Golding's "Lord Of The Flies"

2729 words - 11 pages It can be said that a certain degree of darkness lies within every person, but this darkness will not surface unless given the correct environment. The darkness, however, can emerge and ultimately destroy the person if not checked by reason. If one's inner darkness does surface, the victim then is given the opportunity to reach a point in personal growth, and to gain a sense of self-knowledge from it. That is, when one's darkness appears, one

This Is An Essay On The Woman In The Odyssey And Their Influences On His Travels

993 words - 4 pages The Odyssey is an epic about a Greek warrior in the Trojan War whose wanderings around his known world and his perilous encounters are the basis of the story. Odysseus' absence from his home is prolonged by the influences of the women whom he encounters.In this epic, several female characters had a profound effect on the plot. They wielded their influence through typically feminine skills and attributes: seduction, supernatural powers

Title:Aggressive and Passive. Compare characters in the Handmaid's Tail between Hamlet. Offred is aggressive while Ophelia is passive

537 words - 3 pages Aggressive and PassiveAggressive and Passive are two inverse attitudes to things, events or life. They cause different results. Offred and Ophelia are two women who have contrary destinies because of their different attitudes.Offred is a powerless woman in "the Handmaid's Tale". She's a handmaid of a commander in Gilead. She has no freedom. She belongs to him as a property. Her only duty is to have sex with the commander and give birth to a baby

Black Boy vs Grapes of Wrath

444 words - 2 pages Even though the books of Black Boy and Grapes of Wrath gave a vivid picture of the past American life to the readers regarding the socio-economic bigotry. Both books are similar in focusing the social and economic discrimination in the family setting. On Grapes of Wrath the California prejudice against the immigrants. Prejudice was a strong word, which leaves a bitter taste in the mouth. It is the prejudice against the migrant workers by the

Leprosy ; includes what bacteria it is caused by, the orgin of the disease, how many people are affected by it in the united states and in alaska during 1999 and 2000, and more. 3 pages long

524 words - 3 pages Leprosy is very dangerous for your personal health. It can make you skin fall off. Leprosy slowly eats away at you body. It is deadly to all genders, all ages, all sizes and all races.Another name for leprosy is Hansen's Disease. Leprosy is caused by the organism mycobacterium leprae. The pathogen that carries it is bacteria. Throughout the years people have suspected that inhaling and touching the bacteria could spread leprosy.Symptoms of

Reality Vs. Appearance - Hamlet

978 words - 4 pages In the play "Hamlet," Shakespeare's characters are confronted with the timeless question: How can one determine what is actually true from what only seems to be true? Throughout the play, the theme of appearance versus reality is constant. This theme is played out from the beginning, with Claudius' attempt to conceal his secret intentions; Gertrude and Ophelia masking their own truths, and finally Hamlet, who assumes the role of a madman in

Similar Papers

Study To Investigate The Order Of Conservation Tasks In Young Children Piaget

3027 words - 13 pages not. The presence of demand characteristics can be used to explain why Piaget developed different results from other developmental psychologists.Horizontal décalage is "the step by step acquisition of new operations in conservation", and means the change in the level of the child's performance at conserving mass, liquid, length and quantity. This states that some conservation of materials is mastered before others, and that the order is

In Specific, The Mass Of A Volatile Unknown Liquid Was Discovered With The Use Of The Calorimeter

1015 words - 5 pages QH20 and setting them equal in magnitude to Qmetal. This equation depends on the conservation of energy in the form of Delta T.We concluded that the molar mass was around 74.81, and that the specific heat of this metal was about .334, This is reasonable; during our two trials, data that varied little led to calculations showing similar data.Method of Operation.First we will weigh the unknown metal. We will then take the unknown metal and heat it

Title: Conservation Of Energy Lab Purpose: To Verify That The Total Energy Of An Object Doesn't Change If The Object Hasn't Done Work

667 words - 3 pages Title: Conservation of Energy LabPurpose: To verify that the total energy of an object doesn't change if the object hasn't done work.Procedure:1. Attach a photo gate to the bottom of the tube that is attached to a vertical metal rod.2. Attach the photo gate to the computer, and open Mac Motion.3. Record all measurements, tube to ground, tube to photo gate.4. Go get a small piece of PVC pipe that will be dropped through the tube5. Measure both

Development Of Pre Dried And Blended Lime Mortars For The Ready Mix Market

2747 words - 11 pages is then mixed with sand (and water if made from a dry hydrated lime). The final stage in this process is the setting of the lime in which the carbon dioxide is reabsorbed back into the calcium hydroxide to form calcium carbonate, generally in the form of calcite. This process is known as carbonation.When we use a fresh lime mortar for mass masonry construction the amount of calcite present depends upon the degree to which the carbonation of