The results of the study pertaining to comparative evaluation of two different packaging materials on quality of avocado milk shake powder are summarized in this chapter. Samples were kept in room temperature also to estimate the changes in normal pace. Accelerated shelf life studies are helpful in getting indicators of quality deterioration in short period of time so that the actual shelf life can be predicted based on the moisture uptake, permeability of packaging material, area of package exposed to storage environment and other factors. The two packaging materials selected in this study are 1)
0.1M 0.05M 0.025M 0.0125M 0.00625M Use equation C1V1 = C2V2 to calculate the amount of water needed to dilute the solution. 10ml of 0.1M KI + 10ml of deionized water = 20ml of 0.05M KI Measuring the time for the colour change to occur Using a pipette, add 1ml of H2O2, HCl, starch solution and 3ml of S2O3 into a cuvette. Set up the spectrophotometer and put the cuvette into the machine Data collection starts now, allow 5 seconds.
Exercise 1 1. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Using your results from Data Table 1 as a guide, how would you test this material for the presence of sodium bicarbonate? B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript33 Words
You must first test the pH level of the amylase and starch solution using pH test strips, so that the experiment may be fair m. Then measure 3cm3 of amylase solution using the measuring cylinder, the pour it into the test tubes labeled A1-A5 n. Do the same for the starch solution but pour into the test tubes labeled S1-S5 o. Put test tubes A1 and S1 into the beaker labeled “cold water” p. Put test tubes A2 and S2 into the beaker labeled “normal water” q. Put test tubes A3 and S3 into the beaker labeled “warm water” r. Put test tubes A4 and S4 into the beaker labeled “very warm water” s. Put test tubes A5 and S5 into the beaker labeled “hot water” t. Mix the amylase solution with the starch solution when both are at the same temperature in each beakers (pour the amylase solution into the starch solution) u. Quickly add 3 drops of iodine solution into all 5 mixed amylase and starch solutions, while starting the stopwatch for each (should be 5 separate
This can also speed up the reaction between calcium carbonate and hydrochloric acid with a higher temperature as a higher temperature can let the particles to have a higher kinetic energy for more effective collisions to have a higher rate of reaction. From the calculation, the percentage if calcium carbonate in the toothpaste is found to be at about 20.14% which has a small difference from the literature value of 20%. This maybe cause by the errors when carried out the experiment such as parallax errors. For example, the position of eye level when taking reading or measuring which are not perpendicular to the scale of the instrument will result in the inaccuracy of the data.
First of all, the apparatus has to be chosen that would collect the gases produced at the anode hence Hofmann Voltameter was chosen to carry out the electrolysis in. Second of all, I had to come up with a method to separate oxygen and chlorine gas. Since both of them are gases it became very hard to come up with a method, hence I researched on the characteristics of both gases. I found out that chlorine is soluble in water while oxygen is not soluble in water. 5.8g of chlorine gas dissolves in 1kg of water at 30ºC (The Columbia Electronic Encyclopedia, 2013) and 40mg of oxygen gas is soluble in 1kg of water at 25ºC (Lenntech,
15) After each cuvette was tested, place the distilled water sample (Cuvette zero) to reset the spectrometer and to ensure that the scale is calibrated and repeat for each cuvette test. Data/Results: Tube Number Concentration Of CoCL2 (Mg/ML) CoCL2 Stock (ML) Distilled Water (ML) Spectrometry Reading at
1 Experiment 7: Titration of an Antacid Objective: In this experiment, you will standardize a solution of base using the analytical technique known as titration. Using this standardized solution, you will determine the acid neutralizing power of a commercially available antacid tablet. Introduction An understanding of the properties of acids and bases is an essential part of understanding chemical reactions (see Tro, pp 167-171).
The purpose of this lab was to determine the percent water in magnesium sulfate heptahydrate, or Epsom salt. The experimental percent water is determined to be 42.06% in both trials, making the average also 42.06%. To determine this percent water a heating and cooling procedure was used. First, the vials were cleaned of impurities using the lab oven and were not touched after this point.
Leah Romero 10/30/2017 Conclusion Lab 3 Chem 102L In lab 3, fundamentals of chromatography, the purpose was to examine how components of mixtures can be separated by taking advantage of different in physical properties. A huge process in this lab was paper chromatography, which was used to isolate food dyes that are found in different drink mixes. The different chromatograms of FD&C dyes were compared to identify which dyes are present in each of the mixes.
The control in the experiment is water. Units used while timing the productivity of gas from an Alka-Seltzer tablet in different temperatures is, seconds. In order to find out if temperature controls the rate of chemical reaction, whether hot water is a more effective way to make the gas produce at a faster speed, it would be necessary to compare the results of different temperatures at the end of each trial. In order to do this the scientists will measure the volume of gas that is produced within a 10 second interval time after the tablet begins to react.
Purpose The purpose of this experiment was to evaluate the stoichiometric relationship between the testing agents and to identify the products formed. The relationship was found by completing three acid and base neutralization reactions using phosphoric acid, which is a triprotic acid, with different volumes of sodium hydroxide. Introduction Procedure Phosphoric acid solution with a volume of 1.00 mL and a molarity of 6.00 M was transferred into a 125-mL Erlenmeyer flask using a volumetric pipette.
All things considered, the results proved that the unknown substance or element was barium since the calculated density was 3.9 g/mL. To expand upon, the density was calculated by measuring the mass of the metal and using the displacement method to determine the volume of the metal. Also, the best method of disposing the storm water would be to contact a Wastewater Treatment Plant (WWTP) so that they could put it through a purification process, making all that water reusable. Meanwhile, the percent of recovery was calculated by the formula Percent Recovery=observed valuetrue value *100%. Furthermore, according to the pie chart created in the data analysis, the sample given contained of the percent by mass for metal to be 5.2%, salt was 3.3%, wood was 3.1%, plastic was 4.5%, rock was 12.5%, sand was 11.8%, and water was 59.6%. Also, the formula used to calculate the percent error was Percent Error=observed value-true valuetrue
The second step is about finding the theoretical yield, which will help to determine the correct amount of Ca(OH)2 can be made in chemical reaction. However, before doing this, it’s necessary to find whether CaCl2 or NaOH is a limiting reagent. For each test, the limiting reagent is found by multiplying the number of moles of the reactant by 1 mole of Ca(OH)2 and dividing then by a number of moles of reactant from the reaction. The lowest answer in each test will be the limiting reagent. To find a theoretical yield, the limiting reagent was multiplied by the molar mass of Ca(OH)2 and
To do the temperature and dissolved oxygen tests, stick the probe in the water, and it will show numbers. One will be the dissolved oxygen in ppm (parts per million) and the other will be the temperature of the water. To do the pH test, stick the pH paper in the water and compare the color it turns to the scale. To test nitrates, put clear water in a container and dirty water in another, and put powder in them. Shake them and then compare the color they turn to the scale.