Conclusion:The purpose of this lab is to prepare and purify a fuel, ethanol C2H5OH. We learned to do so by the process of fermentation, and distillation. Over the course of 2-3 weeks, we collected and analyzed the data for this lab. On day 1, we prepared our sugar-yeast solution which contained warm water, sugar, and yeast. With the help of the water, the yeast was then the reactant, then which was activated.
Results Sheet, Experiment 13 Brand of Vinegar used:________________ Acetic Acid % from bottle label_____________ | Initial NaOH Reading(estimate to 0.1 mL) | Final NaOH Reading(estimate to 0.1 mL) | Volume NaOH used(Final – Initial) | Trial 1 | 9.5 | 1.3 | 8.2 | Trial 2 | 9.6 | 1.4 | 8.2 | Trial 3 | 9.7 | 1.4 | 8.3 | Average Volume of NaOH used | 8.2 | Calculations: Normality of the acetic acid: .82 Mass of acetic acid: 49.2 % acetic acid (divide the grams, above, by the volume you used to get g/L): 4.92 Answer questions A-G in the lab manual: A. What is the average % acetic acid in your vinegar sample? Standard vinegar is 5% acetic acid. How does your result compare with the standard? The average was 4.92 which is pretty close comparably to the standard.
Date 5/8/2013 Introduction to Organic and Biochemistry CHM 132 Unit 15 Lab (Body Fluids) Buffers Report Sheet Record the properties of each of the flasks on the table below: |Property |Flask 1 |Flask 2 |Flask 3 |Flask 4 | |Contents | | | | | |Initial pH |7.0 |7.0 |7.88 |7.88 | |pH after adding strong acid |2.32 | |6.16 | | |pH after adding strong base | |11.68 | |11.79 | 1. Compare what happen to the pH of flask 1 to what happened to the pH of flask 3 when HCl was added. The pH of flask 1 dropped much more than that of Flask 3. 2. Which substance, water or the buffer does a better job of maintaining pH when small amounts of strong acid are added?
Conclusion 10 Grams of Potassium chlorate when decomposed produces 3.915576 grams oxygen gas and 6.083363 grams potassium chloride Atomic Weight of Magnesium Introduction In this lab we will determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacts with magnesium. The reaction is as follows: Mg + 2HCl -> H2 + Mg2+ (aq) + 2Cl- (aq) There is a one to one relationship between the number of moles of hydrogen gas evolved and the
The result proved: Contract to the hypothesis, at pH 12, activity of enzyme Catecholase and the rate of reaction decreased. Introduction pH is a measure of the concentration of hydrogen H+ in solution so the higher concentration hydrogen ion, the lower pH. pH is one of the most important factors affect to human body. pH was divided three parts on pH scale from pH 0 to pH 14: at pH 7, solutions are neutral. pH > 7 is alkalinity environment that will bind hydrogen ion, and pH < 7 is acidic environment that will donate hydrogen ion.
Hydrate Lab The purpose of this lab is to analyze the percent water in a crystalline hydrate and to indentify the hydrate from a list of possible unknowns. The solid hydrate will be heated to remove the water, and the percent can be found by measuring the mass of the solid before and after heating. The hydrate will be indentified by comparing the percent water in the hydrate with the percent water calculated for the possible unknown. Before the lab there are pre-lab questions: 1. Describe the three general safety rules for working with a Bunsen burner.
With the use of this technique we placed chlorine, bromine, and iodine into solutions containing chloride, bromide, and iodide. In the reaction the free halogen (X2) oxidizes the other halide ion (Y-) and gets reduced by gaining electron(s). In table 3, chlorine was the strongest oxidizing agent and iodine was the weakest oxidizing agent. Since chlorine was the strongest oxidizing agent it will react more and the weak agent will react less. This explanation can be demonstrated in table 3 also because the results of the reactions demonstrates that chloride reacted more by the color of the product compared to the color of chloride in the mineral oil.
Volume of gas = molar volume x number of moles The molecular formula of gaseous hydrocarbons (CxHy) and organic compounds (CxHyOz) can be determined by combustion in excess oxygen to form carbon dioxide and water, using the following equations: CxHy + (x+ y/4) O2 x CO2 + y/2 H2O CxHyOz + (x+ y/4- z/2) O2 x CO2 + y/2 H2O Example 4 When 10 cm3 of a gaseous hydrocarbon was combusted in excess oxygen in an enclosed vessel, the volume of gas (measured at 298K) was reduced by 25 cm3. The addition of excess NaOH (aq) caused a further reduction in gas volume of 40 cm3 (measured at 298 K). The pressure in the vessel was maintained constant at 1 atm throughout the measurements. Find the molecular formula of the
0.10 M NaCN can only combine with 1/2 as many Ag+'s when it makes (Ag(CN)2-) so, yoiur answer is really 0.05 molar solubility of Agl in 0.10 M NaCN ======================================… 3) Predict whether solubility of BaF2 will increase, decrease, or remain the same with the addition of: a) HCl adds H+ , which removes F- ion, by converting it into HF the equilib: BaF2 <=> Ba+2 & 2F- will shift to the right to replace lost F- so,solubility of BaF2 will increase b) KF adds F-, which increases the F- ion, the equilib: BaF2 <=> Ba+2 & 2F- will shift to the left to reduce the added F- so,solubility of BaF2 will decrease c) NaNO3 solubility of BaF2 will remain the same, Na+ions & NO3-1 ions are not in the equilibrium ... and they do not combine with, to remove either Ba+2 ions or F- ions d) Ba(NO3)2 adds Ba+2, which increases the Ba+2 ion concentration, the equilib: BaF2 <=> Ba+2 & 2F- will shift to the left to reduce the added
57 (1) (iii) A triglyceride is also formed in the reaction between glycerol and three molecules of oleic acid, C17H33COOH. State and explain which of the two triglycerides (the one formed from stearic acid or the one formed from oleic acid) has the higher melting point. (the one from) stearic acid; saturated / no (C to C) double bonds; chains pack close together / stronger intermolecular forces / van der Waals’ forces etc; 3 Ignore hydrogen bonding. If wrong choice made, only third mark can be scored. (3) (b) An oil sample containing 0.0100 mol of oil was found to react with 7.61 g of iodine, I2.