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Chem lab acid base titration
Chem lab acid base titration
Titration in chemistry practical
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Experiment 1 Investigation of the suitability of indicators and instrumental detection of equivalence points in acid – base titrations. Objectives To determine the pH titration curve for both strong acid – base titration and weak – acid base titration. To determine the suitability of phenolphthalein and screened methyl orange as acid base indicators for detecting the end points of acid-base titrations. Materials Chemicals 0.1M Hydrochloric acid, 0.1M Acetic acid, 0.1M Sodium hydroxide, 0.1M Ammonium hydroxide, phenolphthalein, screened methyl orange, methyl orange. Apparatus 100ml beakers, 250ml conical flasks, 50ml burettes, 25ml pipettes, pipette fillers, filter funnels, pH meters. Introduction Indicator is normally a weak organic acid or base that has discretely different colours in its protonated and deprotonated figures. They are four sorts of acid base titration : strong acid - weak base titration, weak acid – strong base titration, weak acid - weak base titration and strong acid – strong base titration. Acid and base together are colourless in nature. Indicators are utilized as a part of acid base titration in order to obtain the equivalence points and end points. In this experiment, they are only strong acid - weak base titration and weak acid - strong base titration is examined. Procedure …show more content…
25ml of 0.1M hydrochloric acid is pipetted into a 250ml conical flask. 2-3 drops of the indicator, phenolphthalein is put into the solution in the conical
Materials: 3 400 ml glass beakers, 3 whole tablets of Alka Seltzer, thermometer, stopwatch/timer, thermal glove, hot plate, ice bath
The equation shows how 1 mol of Na2CO3 reacts with 1 mol of H2SO4, so
that I measured were a small flask, a large flask, a tray from a scale, a roll
From looking at the results I can conclude that when the pH was 3 and
Acids and bases are not just in use in a laboratory, they come into play in the every-day, they are important to know, with respect to consumer and food products. PH scale, the potential for hydrogen ion concentration, is important because it pertains to the spectrum of acids and bases. Acids are an H+ donor and bases are a H+ acceptor. We can further identify acids by its sour taste, it turns litmus paper red, and it dissolves metals such as zinc or iron. Bases taste bitter, they turn litmus paper blue, and it has a slippery feeling. The pH scale ranges from one to fourteen, one through six are acids and eight through fourteen are the bases, with seven as a neutral. The acids are considered to have a low pH. whereas the bases or the alkaline
Knives, measuring cups, measuring spoons, pastry brushes, scale, sift, rolling pin, timer, bowl, and cooling
Analysis of Aspirin Tablets Aim --- To discover the percentage of acetylsalicylic acid in a sample of aspirin tablets. ----------------------------------------------------------------- In order to do this, the amount of moles that react with the sodium hydroxide must be known. This is achieved by using the method of back titration.
-Test Tube Racks- To ensure safety and hold the test tubes. -Glass Marker- Helps to reduce inaccuracies and misunderstanding with other specimen test tubes. -250ml Beaker-
I decided to experiment with pHs within the range pH 2 to pH7, as I
EDTA Titrations [homepage on the internet]. No date. [cited 2014 Mar 24]. Available from: http://bionmr.unl.edu/courses/chem221/lectures/chapter-12.ppt.
The purpose of this lab was to see firsthand the diffusion of a substance across a selectively permeable membrane. Diffusion is the movement of molecules from an area of high concentration to an area of lower concentration until both concentrations are equal, or as you could more professionally call it, equilibrium. This concept is one that we have been studying in depth currently in Biology class.
Some improvements to the experiment might be using Na Acetate or Na Citrate as buffers instead of KHPO4. The pH ranges are 4.5-5.5 and 4.7-5.5, respectively. This range falls closer to the ideal pH of 5, then KHPO4 (pH
vii. This would allow the determination of the percentage of citric acid in the lemon juice specifically, rather than the total acidity. The results of this could have been compared to those of the titration, and the contribution of citric acid to the overall initial acidity could have been determined.
0.1M HCl, 10 mL of 0.1N KMnO4, 0.2 g. KI, 5 mL of alcohol, and 5 mL of
For this experiment we used titration to standardize the exact concentration of NaOH. Titration is the process of carefully adding one solution from a buret to another substance in a flask until all of the substance in the flask has reacted. Standardizing is the process of determining a solutions concentration. When a solution has been standardized it is referred to as a standard solution. To know when a solution is at its end point an indicator is added to acidic solution. An indicator is an organic dye that is added to an acidic solution. The indicator is one color is in the acidic solution and another color in the basic solutions. An end point occurs when the organic dye changes colors to indicate that the reaction is over (Lab Guide pg. 141).