A hot plate was placed under the ring stand. 50 mL of 3.0 M NaOH in a 250 mL beaker and a stir bar was placed in the beaker. The beaker with NaOH was placed on the hot plate and 3.75 grams of NaAlO2*5H2O was placed in the beaker. The temperature probe was placed in the beaker with the solution, not touching the bottom of the beaker. The solution was heated and stirred till the solution dissolved.
Weighed 1 gram of NaC2H3O2 and mixed it with ionized water. Boiled 12 mL of 1.0M Acetic Acid added into a beaker containing the sodium carbonate on a hot plate until all the liquid is evaporated
The purpose of the lab is to acquire the percent composition of zinc and copper. The procedure included obtaining a post 1983 penny and washing it with soap and water. Using a triangular file, we made an X on the penny. Then, we cleaned the top and bottom of the penny with steel wool until it was shiny. We rinsed the penny in acetone and dried it with paper towel.
Step 1: Calculate the mean, median, and standard deviation for ounces in the bottles. Answer: Mean 14.87 Median 14.8 Standard Deveiation 0.55033 For the full calculation, refer to Appendix #1 at the end of the essay.
3. In this experiment, the percent yield was 90%. This number implies that there was little error in this experiment. However, this result could have been caused by certain external factors.
Research Question: To investigate and compare how different temperature (5℃, 15℃, 25℃, 35℃, 45℃) can affect the concentration of carbon dioxide in soda water through titration with sodium hydroxide solution. Introduction: Carbon dioxide plays an important role in soft drinks. Soda water is manufactured by pumping carbon dioxide into water under high pressure. Carbon dioxide dissolves in water to form carbonic acid, which is the fizz we find in soft drinks. CO2 + H2O ⇌
Since you have expressed an interest in Applied Mathematics, Chemistry, Computer Science, Geology, Mathematics or Physics, we would like to know a bit more about you. (Please limit your total response to the following 2 questions to 350 words.) (Chemistry & Neuroscience) 1. Tell us about a skill or concept related to your anticipated area of study, that you found challenging and rewarding to learn.
Discussion: End point in this acid-base titration experiment refers to the point where the chemical reaction has reached its conclusion and no additional titrant should be added. The end point of this experiment can be obtained when the indicator used changes colour. For example colourless to light pink when phenolphthalein is used and red to orange and subsequently yellow when methyl orange is used. Equivalence point, also known as stoichiometric point in an acid-base titration refers to the point where the reacting acid and base is in equal proportions. In the graph plotted, pH against volume of NaOH, the graph becomes nearly vertical at the equivalence point.
IV. Data and observations Mass of beaker (g) 174.01 Mass of beaker + NaOH pellets (g) 174.54 Mass of NaOH pellets 0.53 TRIAL 1 TRIAL 2 Mass of potassium acid phtalate (KHP) (g) 0.15 0.15 final buret reading (ml) 30.75
They are all average and your teaching skills will be completely different. Standard Deviation is a major part to know in statistics. Many people tend to overlook standard deviation not realizing how much it can affect your ending results. As I addressed earlier, standard deviation may be very hard to understand but once you learn it in the end it will be very
The standard deviation calculations in my experiment are used for finding out how the common wheat sample values are spread above and below the mean. A high standard deviation indicates that the data is widely spread around the mean, which makes the data less reliable. A low standard deviation in the other hand indicates that the data points are located closely to the mean, which makes the data very reliable. The standard deviation provides important information of the data’s reliability and its significance when making the conclusion. The calculated standard deviation value for all samples with different sucrose concentrations in Table 1.3, Table 1.5 and Table 1.7 is between 2.63 and 4.02.
Determination of Vitamin C Concentration by Titration Serena Kim Vasantha Susarla McGill University Introduction This experiment is being performed to determine the concentration of Vitamin C in different solutions by performing a redox reaction with potassium iodate. Vitamin C, which is also called ascorbic acid, can be naturally found in citrus fruits and common vegetables. Vitamin C is considered as an antioxidant because it acts as a coenzyme and reducing agent in several different ways.
Practical I: Acid-base equilibrium & pH of solutions Aims/Objectives: 1. To determine the pH range where the indicator changes colour. 2. To identify the suitable indicators for different titrations. 3.
The mean and mode of the produced drugs will be close to the middle of the distribution curve while the standard deviation will be equal to
That caused a new initial reading of NaOH on the burette (see Table1 & 2). The drops were caused because the burette was not tightened enough at the bottom to avoid it from being hard to release the basic solution for titrating the acid. The volume of the acid used for each titration was 25ml. The volume of the solution was then calculated by subtracting the initial volume from the final volume. We then calculated the average volume at each temperature.
