Hypothesis: If one-day pinto bean seedlings are soaked in a water solution, 1% NaCl solution, and 3% NaCl solution, the seedlings exposed to higher sodium concentrations will have decreased cellular respiration rates. Treatments: This experiment involved three treatments and a control. The goal of the experiment was to see how different levels of NaCl affect the rates of cellular respiration in day-old pinto bean seedlings.
Clean up and return the materials. Paragraph 3 In my bar graph I presented the relationship between the temperature of water and an Alka-Seltzer’s rate of reaction time when dropped into the water. The data proves that if the temperature of water increases, then the reaction rate of an Alka-Seltzer tablet will increase as well.
In this experiment, racemic 2-methylcyclohexanone was reduced using sodium borohydride as a nucleophile to give a diastereomeric mixture of cis and trans secondary alcohols. The products were analyzed for purity using IR spectroscopy and gas chromatography. 1.2 g of 2-methylcyclohexanone and 10 mL of methanol were combined in a flask and cooled in an ice bath. Two 100 mg portions of sodium borohydride were added to the flask and stirred. 5 mL of 3M sodium hydroxide, 5 mL of de-ionized water, and 15 mL of hexane were added to the reaction flask and stirred.
In addition, phenolphthalein was added as an indicator. The aliquots were titrated against sodium hydroxide (NaOH) solution until end point was reached, after which volume of NaOH consumed was recorded. The value of the rate constant, k, obtained was 0.0002 s-1. The experiment was then repeated with 40/60 V/V isopropanol/water mixture and a larger value of k = 0.0007 s-1 was obtained. We concluded that the rate of hydrolysis of (CH3)3CCl is directly proportional to water content in the solvent mixture.
The Effect of Alkaseltzer Tablets on the Boiling Point of Water Zackary Zambrano Chemistry Honors Mrs.Gregor Period-3 10/5/16 Introduction Statement of Purpose: The purpose of this experiment is to see whether or not alkaseltzer tablets have an effect on the boiling point of 100 mL of water. The control is just water, the variable groups are 100 mL of water with one tablet, and 100 mL of water with two tablets. “What exactly is boiling? The technical definition is what occurs when the vapor pressure of a liquid is greater than or equal to the atmospheric pressure. ”(Lopez,k) Simply put water, boils when enough energy is released to cause bubbles and then turn to vapor.
A pH probe connected through Microlab was calibrated using buffer solutions of pH 4.00, 7.00, and 10.00. The calibrated pH probe was used in order to measure the pH of the titrated solution of the unknown weak acid. These same steps were repeated except 2 mL of the strong base were titrated into the weak acid solution instead of 4 mL. This process was repeated 10 times. Data The data from Table 1 was gathered by calculating the pK_a and K_a of the unknown weak acid using the change in volume and pH of the solution.
When increased respiration rises the blood pH level beyond the normal range 7.35-7.45, it causes respiratory alkalosis. Some causes are anxiety, fever, hyperventilation, pregnancy or any lung disease that causes shortness of breath (Respiratory alkalosis, 2014). Mechanisms responsible for compensation to respiratory alkalosis are rapid cell buffering and decrease in renal acid excretion (Respiratory alkalosis, 2014). To treat respiratory alkalosis carbon dioxide is to be inhaled. Inhaling inside of a paper bag or using a mask that causes you to re-breath carbon dioxide can be used as treatment (Respiratory alkalosis, 2016).
We used a Buchner funnel to collect benzocaine. We used three 10 ml of water to wash the product. After the product was dry, we weighed, calculate the percent yield and determined the melting point of the product.
2.4.1. Tetramethyl glucose acetylation 1gm of tetramethyl glucose was dissolved in 5ml of acetic anhydride and added to fused sodium acetate of 0.375gm and mixed for 10 minutes and allowed to cool. To this mixture 7.5ml of toluene and 5ml of dry ether were added. The whole mixture evaporated to syrup on a water bath at 50 °C. The product dissolved in the dry ether after washing with toluene.
Introduction Alka-Seltzer has been on the market since 1931 and has helped to relieve indigestion and upset stomach. The tablets began to fizz and bubble when dropped into water. “The fizziness happens when baking soda (sodium bicarbonate) and citric acid react chemically in water. They yield sodium citrate, water and carbon dioxide gas, which causes bubbles.” Based on this information, we will measure the reaction time of AlKa- Seltzer dissolved in 200 ml of water at 3 different tempertures in the first portion of this experiment.
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.
Base is any substance that accepts hydrogen ions in water solutions A: Ranking Substance on the pH Scale 1. pH Scale is the scale used by scientist measuring the relative acidity of a substance B: Some pH Terminology 1. When a solution becomes more basic, the pH rises. Therefore the higher the pH, the more basic the solution: the lower the pH, the more acid in the solution.
Two chemical reactions are carried by adding sodium hydroxide to the acidic solution from Part I. During the first reaction is the neutralization of the excess of nitric acid in the mixture by sodium hydroxide. The second reaction takes the place after naturalization is a complete and NaOH is in excess. While the liquid inside the beaker is being stirred, with the stirring rod, 10 ml of 6 M NaOH is poured into the solution from Part I at 1 mL at a time. After each 1 mL the solution is tested for acidity with red litmus paper.
The acid region is the curve on the left of the graph, whereas the base region is on the left. When HCl was added to both buffer, the pH of the buffer decrease. Ideally, the designed buffer can maintain the pH at 1 units: in this case between 3 to 5. Once the pH surpassed these change, the change in volume and pH will be drastic.
Methods of Data Collection Measuring the independent variable: The pH (the independent variable) is being tested on the turnip peroxidase to observe the reaction rates. 5 levels of pH are required for these series of reactions so pH buffers of 3, 5, 7, 9, and 11 are to be placed in each of the waters that will be put into the cuvettes for the experiment. Measuring the dependent variable: A colorimeter must be used in order to calculate the reaction rate/absorbance level of the turnip peroxidase when the different pH levels affect it. The colorimeter can be used to measure the transfer of heat to or from an object.