Write the equation for the dissolution of sodium carbonate in water as found in your laboratory guide.
When sodium carbonate is dissolved in water, it doesn’t dissociate, or break up, completely. There is always some sodium carbonate in solution. Knowing this, which of the two samples is most alkaline? Explain why you say this.
Answer:
Na2CO3 + H2O ---> 2NaOH+ + H2CO3-2
Sodium carbonate is the resulting salt of a strong base and a weak acid. Thus, when it is dissolved in water, NaOH, strong base, and H2CO3, weak acid, are the products of the hydrolysis. The OH ions from the strong base are predominant in solution and deprotonate H2CO3 to form another conjugate base, HCO3 and CO3. As a result, the overall pH of the solution is alkaline due
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They use this exact kit, so what you have done is on-the-job training. There is a difference, however. These kits were set up using water samples provided for you. In real-life situations, workers collect water samples in a lake or stream instead of using Samples A and B that you tested. For this lab to work, sodium carbonate was added to make the water samples alkaline. In lakes and streams it is calcium carbonate (CaCO3) that causes alkalinity. Calcium carbonate acts as a buffer, a substance that serves to resist small changes in acidity or alkalinity in a solution. When acid rain enters lake water, it can be neutralized by the bases present and thus the lake does not become too acidic. Since the key ion is the hydroxide ion, the nature of the cation doesn’t matter in this case. All over the world, right now, pollution workers are measuring calcium carbonate in lakes and streams.
If a worker studied two lakes and Lake X had a greater ppm of calcium carbonate than Lake Z, which of the two lakes would be able to withstand a greater amount of acid rain? Explain your answer.
Answer:
Lake X would be able to withstand a greater amount of acid rain because it has a greater buffering capacity due to the higher concentration of calcium carbonate present that will react with the excess acid. As a result, it would be able to better resist changes
Hypothesis: The Alka Seltzer will dissolve fastest in hot water and slowest in cold water.
At this point the identity of the unknown compound was hypothesized to be calcium nitrate. In order to test this hypothesis, both the unknown compound and known compound were reacted with five different compounds and the results of those reactions were compared. It was important to compare the known and unknown compounds quantitatively as well to ensure that they were indeed the same compound. This was accomplished by reacting them both with a third compound which would produce an insoluble salt that could be filte...
...ost likely to be battery acid. If it is water, it has a Ph level of around 7. For vinegar, the Ph level is approximately 2.4 - 3.4. Thus, once testing the liquid compare it with the Ph levels above to discover the mystery solution.
The sand is If the water with Alka-Seltzer tablets is stirred during the reaction, then the rates of reactions will increase because the particles will be forced to make contact with each other and... ... middle of paper ... ...results anomalies because they are the outcome of dissociation of calcium and magnesium ions,. Evaluation: What is the difference between My results were very reliable, because by looking at my graphs I can see a trend that relates to my scientific background. It is also evident that I have obtained a reliable set of results when I see that.
The next week was dedicated to the titration of household supplies. For this, we used two sodas, Cheerwine, and Diet Coke, as well as dish soap. Dish soap, along with many other household cleaning agents, has buffering properties. A buffer acts as a pH stabilizer. It is a combination of a weak acid and its conjugate base, or a weak base combined with its conjugate acid. If a strong acid ion is added, the buffer simply replaces it with a weak acid ion, therefore causing little change in the pH of the solution. Household cleaning products usually have some form of a buffer, because otherwise, they would burn skin to touch. As expected, the two sodas were originally acidic, while the soap was basic.
to the essay by validating his point of view. In the same way, the author used effective illustrations and examples to prove his point. These examples and illustrations simplified the readers understanding as to how severe acid rain is and how we can try to prevent it. For instance, one great illustration adopted in the essay reports, “Lumsden Lake, on the north shore of Ontario’s Georgian Bay, twinkles like a sapphire in a setting verdant forest and sparkling quartz.
There are many people who don't fully understand how the water ionizer works, and they want to find out how alkaline water is produced with this appliance before buying it. Read this article if you are interested in understanding how exactly the water ionizer works, and how it produces alkaline
Solid A was identified to be sodium chloride, solid B was identified to be sucrose, and Solid C was identified to be corn starch. Within the Information Chart – Mystery White Solid Lab there are results that distinguishes itself from the other 4 experimental results within each test. Such as: the high conductivity and high melting point of sodium chloride, and the iodine reaction of corn starch. Solid A is an ionic compound due to its high melting point and high electrical conductivity (7), within the Information Chart – Mystery White Solid Lab there is only one ionic compound which is sodium chloride, with the test results of Solid A, it can be concluded that is a sodium chloride. Solid B was identified as sucrose due to its low electrical
Anne Zhang 3/6/14 BSGE 7-1 Lab Report Problem Paragraph 1 Question: What is the effect of temperature on the dissolving time of an Alka-Seltzer? Alka-Seltzer is made up of baking soda, aspirin, and citric acid which gives the tablet the fizz when dropped in any temperature water. “Alka-Seltzer is a medication that works as a pain reliever and an antacid.
Determining the Concentration Of Limewater Solution Aim: The aim of this experiment is it to find out the concentration of Limewater by performing a titration with hydrochloric acid which has concentration exactly 2.00M.. What is required for me is that I have to design my own experiment and chose the right and appropriate apparatus and equipment. I will be provided with 250cm3 of limewater, which has been made to which contains approximately 1g/dm3 of calcium Hydroxide. This hypothesis from www.studentcentral.co.uk We were also give Hydrochloric acid (HCl) with a concentration of 2.00 mol/dm3 normal laboratory apparatus was also given and so was an indicator.
carbonate and hydrochloric acid,. I will look at the various factors. affecting the reaction and select one variable to change, while the others keep constant in order to carry out a detailed investigation. Formulae = ==
Neutralization Experiment AIM:- To investigate how heat is given out in neutralizing sodium hydroxide (NaOH) using different concentrations of Hydrochloric Acid. Background Information:- Substances that neutralize acids are called alkalis. An acid is a substance that forms hydrogen ions (H+ ) when placed in water. It can also be described as a proton donor as it provides H+ ions. An example of an acid is hydrochloric acid (HCl), Sulphuric acid (H2SO4) etc.
In this experiment, the calcium carbonate was in the form of marble chips. The calcium carbonate reacted with hydrochloric acid when the acid was poured into marble chips. Due to calcium carbonate’s higher reactivity, it displaced hydrogen in the hydrochloric acid. As a result, products of calcium chloride, carbon dioxide and water were formed. As the chemical reaction occurred, the water in the measuring cylinder was displaced and gas bubbles that were blowing out represented carbon dioxide.
As more NaOH is added, the pH will become more basic as H2C2O4 .2H2O has been completely neutralized and now an excess of OH- ions are present in the solution.12
The labels have fallen off of two bottles thought to contain solid sodium chloride or solid sodium carbonate. Describe a simple experiment which would allow you to determine which bottle contains which solid.