cotton to 15 parts acid. concentrated nitric acid concentrated sulfuric acid cotton balls (almost pure cellulose) Nitrocellulose Preparation Chill the acids below 0°C. In a fume hood‚ mix equal parts nitric and sulfuric acid in a beaker. Drop cotton balls into the acid. You can tamp them down using a glass stirring rod. Don’t use metal. Allow the nitration reaction to proceed for about 15 minutes (Schönbein’s time was 2 minutes)‚ then run cold tap water into the beaker to dilute the acid. Allow the water
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Standard Reduction Potentials‚ Equilibrium Constants and Investigating a Lead-Acid Electrolytic Cell Purpose Experimental Methods All procedures were followed according to the lab manual (experiment 10 – Electrochemistry Laboratory). Data and Observations Part A: Grams of FeSO4 used: 0.759 Voltage during voltmeter and battery check: 9.23V Table 1. Electrochemical Cells Data Part B: Table 2. Lead-Acid Battery Results and Calculations In order to make 5ml of 1M FeSO4(aq)
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Check your bubbling carefully – bubbling errors will not be negotiated. Turn in your scantron and retain your exam (with your answers circled). Potentially useful info : Kw = 1 x 10‒14 at 25°C pH = −log [H3O+] pH = pKa + log ([base] / [acid]) R = 0.0821 atm•lit/mol•K or 8.314 J/mol•K Kp = Kc(RT)∆n(gas) ΔG = ΔH – TΔS ΔG° = ΔH° – TΔS° ΔG° = −RTlnK ΔG = ΔG° + RTlnQ ΔG°rxn = ∑mΔG°f(prod) − ∑mΔG°f(react) (likewise for ΔH°rxn and ΔS°rxn) ln(K1/K2) = (ΔH°rxn / R){(1/T2) – (1/T1)} The
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Y ou may have heard that omega 3 fatty acids can actually play a role in the treatment and prevention of depression. Does the rumor reign true? Can consuming omega 3 fatty acids really help fight depression? This article will give you all the information you need to know on the hot topic of omega 3 fatty acids and depression. To begin‚ we will start by explaining what omega 3 fatty acids are. Omega 3 fatty acids are essential fatty acids. This means that they are vital for human health. However
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Chemistry Laboratory I Acid Base Review Definition In general‚ an acid is a substance that can donate a proton (H+) and a base is a substance that can accept a proton. Any proton in an organic molecule can potentially be donated. The most acidic proton in a molecule would be donated first. Any lone pair in an organic molecule can act as the proton acceptor. An acid (HA) reacts with a base (in this case H2O) to form the conjugate base of the acid (A-) and the conjugate acid of the base (H3O+).
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must you carry out the oxidation of Cu with HNO3 in a fume hood? Concentrated nitric acid is a toxic oxidant. Avoiding skin contact or inhalation is highly important. The reaction between Cu and HNO3 produces NO2‚ a toxic brown gas; therefore working under the fume is necessary in order to prevent inhaling the toxic gas. b) Why you should be particularly careful when you work with 3 M H2SO4 solution? Sulfuric acid solution is a toxic oxidant. In under to prevent eye‚ skin‚ and clothing contact
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The full strength 1M HCl acid had a pH level of 3.12 (Table 3.1). Sample A2 to A4 remained in the pH 3 level‚ while sample A5 and A6 had a pH range of 4 (Table 3.1). The pH level for 1M HCl dilutions slightly increased between each sample (Table 3.1). The diluted solutions of 1 M NaOH showed a few unexpected results. The original solution of 1 M NaOH was at a pH level of 11.50 (Table 3.1). However‚ the pH of sample B2 increased to 12.81 (Table 3.1). The remaining samples had a decreasing pH pattern
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the RNA bases that are complementary to the DNA template strand that uses uracil opposite to adenine. The RNA polymerase which is an enzyme that moves from the 3’ to 5’end on DNA template strand to synthesis mRNA from 5’ to 3’. b. What is the amino acid sequence produced by translation of the mRNA sequence?
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and depression. Natural Cures for Depression - Nutrition Omega-3 Fatty Acids: These are a good type of fat that are essential for health of the human brain. Our body cannot synthesize these nutrients. Hence these should be included in the dietary intake. Fish‚ especially fatty ones like salmon‚ sardines‚ mackerel‚ trout‚ and herring are rich sources of these compounds. Studies have found that Omega-3 fatty acids result in low levels of depression. People of Japan and Taiwan‚ who have high
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constant of acetic acid Chemistry (HL) Research Question: To determine the pH of various mixtures of sodium acetate and acetic acid in an aqueous solution and hence to find the dissociation constant of the acetic acid. Background: The mixture of sodium acetate and acetic acid in aqueous solution is a buffer solution. Buffer solutions are the solutions which resist a sudden change in the pH due to addition of small amounts of strong acid or base. An acidic buffer is a mixture of a weak acid and its salt
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