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Acid base titration procedure and observation
Acid base titration procedure and observation
Titration practicle
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Recommended: Acid base titration procedure and observation
In this experiment we are trying to identify an unknown acid or base and its concentration by using the method of titration. The pKa values and the titration curve help aid in identifying of the unknown. In our case we had a base as our unknown (analyte). The use of a certain amount of sodium hydroxide and hydrochloric acid will be used to titrate the unknown solution that is given. This is the tirant. We used hydrochloric acid as our titrant. We achieved a pH of 5.56 at an end point of 10 milliliters. The unknown’s concentration was around 0.098 M at pka(s) of 6 and 7. The sodium hydroxide and hydrochloric acid are called titrant and it is contained in a container called burette. The unknown solution is held in an erlenmeyer flask. The purpose of the experiment is to measure the weak acid and base by neutrilizing it and determining the unknown acid by titration.
Introduction: Titration is a common laboratory practices that is involved in quantitative chemical analysis. This process is also called titrimetry or volumetric analysis (since we are dealing with volumes in our analysis). This process is used is used to determine unknown concentration of a solution. This is unknown solution is known as the analyte. The standard solution or known concentrations is called titrant. The titrant and analyte react to determine an accurate concentration of the unknown solution. This is the process that happens in titration. There are many types of titrations like acid-base titrations, redox titration, and gas phase titration, but the most commonly used titration is acid base titration. An acid base titration is used when an acid or base concentration needs to be known (for example this lab is an acid base titration). In the process of acid- ...
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... For example, when weighing out the amount of HCL and NaOH needed for the standard solutions, the last decimal point on the mass number on the scale would be shifting. So this causes an uncertainty. This is another type error caused by instruments. The pipets for example wouldn’t be able to take in the right amount of solution because the edge is chipped or cracked. Also, if one did not calibrate the pH meter by Scholar 425. The value they receive would be an error. Also dirty burets that have impurities with chemicals or water would affect the concentration of solution. If this happens the molarity will be wrong and the volume would have been read wrongly. Overshooting the endpoint is another error this will give a steep rising curve and a drastic change in the pH. To deal with the change in pH more titrant will be used and thus affecting the volume and molarity.
Record the volume of the sodium thiosulfate solution used in the titration, and repeat the procedure in a duplicate titration.
Possible errors include leaving in the test strips for too long, draining too much water into the aquatic chamber (overfilling/watering), and inverting the tubes for a shorter amount of time than required. Although there are many possible human errors that could be committed in this lab, it is important to note that the tools used for water testing could be expired and could therefore not work as well at detecting the proper levels for dissolved oxygen, pH, and nitrate.
In this experiment, there were several objectives. First, this lab was designed to determine the difference, if any, between the densities of Coke and Diet Coke. It was designed to evaluate the accuracy and precision of several lab equipment measurements. This lab was also designed to be an introduction to the LabQuest Data and the Logger Pro data analysis database. Random, systematic, and gross errors are errors made during experiments that can have significant effects to the results. Random errors do not really have a specific cause, but still causes a few of the measurements to either be a little high or a little low. Systematic errors occur when there are limitations or mistakes on lab equipment or lab procedures. These kinds of errors cause measurements to be either be always high or always low. The last kind of error is gross errors. Gross errors occur when machines or equipment fail completely. However, gross errors usually occur due to a personal mistake. For this experiment, the number of significant figures is very important and depends on the equipment being used. When using the volumetric pipette and burette, the measurements are rounded to the hundredth place while in a graduated cylinder, it is rounded to the tenth place.
Possible sources of error in this experiment include the inaccuracy of measurements, as correct measurements are vital for the experiment.
One possible source of experimental error could be not having a solid measurement of magnesium hydroxide nor citric acid. This is because we were told to measure out between 5.6g-5.8g for magnesium hydroxide and 14g-21g for citric acid. If accuracy measures how closely a measured value is to the accepted value and or true value, then accuracy may not have been an aspect that was achieved in this lab. Therefore, not having a solid precise measurement and accurate measurement was another source of experimental error.
an unknown amino acid. A titration curve is the plot of the pH versus the volume
If the concentration of the solution is too concentrated, then it may not give accurate results. 5.
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.
pH is usually referred to test out or find the measure of a concentration of hydrogen ions. pH is used to measure whether the solution if it is a base or an acid. The term pH stands for power of hydrogen. Usually there is a scale for measuring pH, Solution with a 7 or below is consider an acidic solution, but an pH greater than 7 is consider a base solution, and 7 is a neutral solution. The pH scale is a set of solution standards whose pH is established by the international system. Most of the times pH can be measured through concentration cells which measure the differences between hydrogen electrodes. Finding the pH for solution can be done in various ways such as a pH meter or glass electrode.
Firstly, we need to keep the chemical at a constant concentration. So, in this experiment we have chosen to keep hydrochloric acid at a constant concentration (5cm3). We could have, however, used Sodium Thiosulphate as a constant, but we had chosen to use Hydrochloric acid. Next, we must make sure that the solution is kept at a constant volume throughout the experiment. If the volume is different, then it could give different results if it was at a constant volume.
These results could be inaccurate and be caused by other issues such as the imperfectness of the
It is evident that the mass measurement were not the same for the three trials performed. Even though, the penny being weighed is the same for all three trials, the mass recorded were not the same for all. This inaccurate calibration of the scale may have affected the results for the measurement of mass. Aside from the scale, the caliper could have caused inaccuracies in the data collected. From the three trials of the recorded diameter and height, it was evident that the measurements of the caliper showed variations also. Because of this, the caliper is also a source of the inaccuracies of the data. Also, the conditions of the pennies that were used in the experiment were not exactly the same with each other. For example, some pennies are have a lot of dirt on it. The dirt in the penny could increase the mass and volume of the penny so it caused inaccuracies in the data as
In this experiment three different equations were used and they are the Stoichiometry of Titration Reaction, Converting mL to L, and Calculating the Molarity of NaOH and HCl (Lab Guide pg. 142 and 143).
EDTA Titrations [homepage on the internet]. No date. [cited 2014 Mar 24]. Available from: http://bionmr.unl.edu/courses/chem221/lectures/chapter-12.ppt.
General uncertainty – the quality of the readings of most instruments decreases over time due to any number of environmental and internal factors, as frequent calibration is necessary. When several consecutive incorrect readings are taken for a liquid of known specific density, it is clear that the hydrometer is out of