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Acid base reactions essay
Basic questions on acids,bases and salts
Acid base reactions essay
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Background/Introduction:
The purpose of the experiment is to determine the ID of an unknown diprotic acid by establishing its pKa values. The first phase is to determine the unknown diprotic acid by titration, which is a technique where a solution of known concentration is used to determine the molecular weight. While the second phase involved seeing how much NaOH needed to standardize diprotic acid.
Brønsted and Lowry’s concept of acids and bases detail that these reactions are basically proton transfer reactions. Acids act as proton donors, meaning that they give away a hydrogen ion. While bases act as a proton acceptors, entailing that they receive a hydrogen ion. During reactions between acids and bases, acids are paired with hydrogen, while bases are paired with a hydroxide group. When these two react in an aqueous solution and a salt is produced, that lacks both acidic and basic properties, and water is produced. Then neutralization has occurred. Neutralization occurs when a strong acid and a strong base react, because they completely dissociate in water.
Polyprotic acids are acids that are capable of donating more than one proton per molecule in acid-base reactions, hence the prefix poly- meaning many, and prot- referring to protons. Polyprotic acids are acids that have more than one ionizable hydrogen atom per molecule. When acids are added to the solution, the acid ionizes. When the acid partially ionizes in solution that means it is a weak acid. Weak acids partially dissociate to produce equilibrium concentration. K_a is the acid ionization constant that refers to when an acid donates a proton. We determine
K_a = ([H_3 O][A^-])/([HX]) pH measures how acidic or basic something is. pH is the measure of the concentratio...
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...nt were quite successful. There were only a couple of mistakes that were committed including over titrating in phase 1 and inaccurate measurements of many substances. However, our results did not differ that much from the actual value and phase 2 went very successfully because we found the amount of NaOH needed to standardize the acid. Overall, I would consider this lab a success because we found the molarity, the amount of moles, the pKa, the ka, the equivalence points, and the molecular weight that did not differ that much from maleic acid. Maybe next time, we could make sure none of our equipment were contaminated and we could take our time with phase 1 of the experiment. Our percent error was just above 5 %, probably due to the fact of the contaminations and inaccurate measurements that were partaken in.
Citation:
Vernier, S.O.P., pg. 25-1 – 25-10; method 1 only
The unknown bacterium that was handed out by the professor labeled “E19” was an irregular and raised shaped bacteria with a smooth texture and it had a white creamy color. The slant growth pattern was filiform and there was a turbid growth in the broth. After all the tests were complete and the results were compared the unknown bacterium was defined as Shigella sonnei. The results that narrowed it down the most were the gram stain, the lactose fermentation test, the citrate utilization test and the indole test. The results for each of the tests performed are listed in Table 1.1 below.
One, each graph demonstrated what a titration curve should look like, with some clear, detectable equivalence points. We were also told prior to starting that our four possible unknowns were glutamic acid, glycine, histidine, and lysine. This allowed for titration curves to be looked up, so we knew what ours should generally look like for each. As well as how many pKa’s and equivalence points should be visible. If I were to do this lab again I would titrate at even slower intervals to allow for the pKa’s that are close together to be more distinct and therefore, easier to calculate. Another thing to call to attention, is that taking the weight of the amino acid prior to dissolving and titrating it allows for the number of moles to be found, using the volume NaOH, as well. This could be more data obtained from this
to react until there is no more left when the acid is added to it.
C. The buffer we prepared in the lab had an actual pH of 7.30, while the theoretical pH of the buffer was 7.25. So, we had a percent error of 0.68%. The most possible reason for the error in the percent error could be because of the experimental procedure. Probably, the beaker was contaminated with some other chemicals and prior to the experiment the beakers were not cleaned properly. The other possibility can be that the right number of chemicals were not mixed while
Normal body functions and metabolism generate large quantities of acids that must be neutralized or eliminated to maintain blood pH balance. Most of the acid is carbonic acid, which is created from carbon dioxide (CO2) and water. Lesser quantities of lactic acid, ketoacids, and other organic acids are also
One of the human errors in the lab was the group was destaining the gel in the sink to rapidly and the gel broke in half cutting off some of the important data. This error could simply be fixed by being more gentle with the data. Also, during the begging of the lab while filling the wells with gel the group did not put the same amount in each. This error could be fixed by simply taking time filling the wells and making sure no more gel is in the micropippette before moving on to the next well. Finally, another human error consisted of the power source getting shut off when our gel was not in it for a total of 20 minutes. The error could be fixed by getting more outlets in the room so the power so the power source was not shut off to early. The major experimental error was the groups were not able to fully distain the gel since the class was over after short amount of time. To fix this experimental error starting the lab sooner and planning more efficiently would allow for enough time to distain the gel. In addition, the buffer after used for one experiment was placed back into the original bottle and used for multiple other experiment what if the buffer had been overused and tampered other experiments would get inconclusive results. An easy way to fix this experimental error is getting little bottles of buffer and throwing them away each time rather then using the same one each time. Thus, if these experimental and human errors were fixed then the outcomes would be more accurate and the interpretation of the data would be
Acid-Base balance is the state of equilibrium between proton donors and proton acceptors in the buffering system of the blood that is maintained at approximately pH 7.35 to 7.45 under normal conditions in arterial blood. It is important to regulate chemical balance or homeostasis of body fluids. Acidity or alkalinity has to be regulated. An acid is a substance that lets out hydrogen ions in solution. Strong acid like hydrochloric acid release all or nearly all their hydrogen ions and weak acids like carbonic acid release some hydrogen ions.
Acids and bases are chemical substances that release ions when dissolved in water. Acids are compounds that release positive hydrogen ions in water. Bases release hydroxide ions, which are compounds made of an oxygen and a hydrogen. Acids and bases are used around the house for cleaning, but the levels of acids and bases in the body are also important. I wanted to test out a few things arounf the house moslt foods and liquids to be precise.Although I don’t have all the materials I need to detrmine the exact ph leve.l I purchased some litmas paper and did a few observations on the reactions that occurred.
The materials I used in this lab were red cabbage juice, red and blue litmus paper, measuring cups, a paper towel, distilled water, vinegar, apple cider vinegar, laundry detergent, lime juice, a pH chart, and finally, a dropper. The first step in this lab report is to take one drop of cabbage juice from the measuring cup and put it into the other measuring cups, or the other 5 liquids, and mix the solution together. Next, using the pH chart, decide the color of the solution and record the results. Third, dip the red and blue litmus paper into all of the measuring cups and place them on a paper towel to determine whether each substance is an acid or base using the pH scale. And finally, record all your results in the data chart putting the number each solution is under “pH”, and putting acidic, basic, or neutral under “effect on litmus
The procedure of this lab experiment has five different steps. The first step in this process is to gather the materials which are cups, shells, acid, measuring spoons, and an electronic balance. The next step in the procedure is to put the acid in three different cups cup A one whole cup, cup B one fourth of a cup, cup C one half tbs. The third step is to put 120
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.
During the preparation of the 0.1 mol L-1 standard hydrochloric acid there is uncertainty associated with the balances and the 250 mL volumetric flask. The uncertainty associated with the balanced could be reduced by using more precise balances. The volumetric flask has a greater uncertainty associated with it. This could be reduced by using more precise glassware. During the standardisation against anhydrous sodium carbonate the balance has uncertainty associated with it again a more precise balance would reduce uncertainty. The largest contributor to uncertainty is the burette this could be lessened by better quality glassware. Uncertainty was reduced by all of the experiment taking place in the same environment so there was no difference in humidity and temperature. The same balance was used for every measurement in the experiment. Using a dropper to make sure the meniscus was as accurate as possible decreased uncertainty. The titration was repeated 5 times reducing random error that could have been associated with the
Chemists have known for some time that the H+ ion doesn’t exist in aqueous solutions as an independent species. The modernized Arrhenius definition of acid is that they are substances that produce H3O+ ions in aqueous solutions. It did not take longer for chemist to find other problems with the Arrhenius definition. In practical terms, the OH- ion is far from being the only base.
pH stands for "Potential Hydrogen", pH is the most basic and fundamental driving force of all our body function. You may be wondeering what ions are responsible for making a solution an acid or a base. It is simple, Acids produce hydrogen ions H+in a water solution while Bases produce hydroxide ions OH- in a water solution. an example for an acid is HCl and an example for a base is NaOH. The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. one through 6 being acidic, 7 being neutral, and eight through 14 being bases.
We encounter acids and bases on our daily lives. Acids are substances that have a pH of less than 7. On the other hand, bases have pH of greater than 7. They both react to each other to form salt.