1.) Explain why the following substances are added to soil by gardeners and farmers. a.) Lime CaO It increases the pH of soil.Soil that is too acidic presents two different problems for crops. First‚ the amount of necessary minerals in the soil such as potassium and calcium decreases. Second‚ aluminum and manganese levels increase to potentially toxic levels below a pH of roughly 5.5.Calcium oxide‚ addresses the problem. It reacts in water to release calcium ions and hydroxide ions‚ which raise
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Determining the enthalpy of neutralization by calorimetry Anam Iqbal Partner’s name: Danielle Hodgson TA’s name: Karinna Section # 003 Due date: November 24‚ 2009 Introduction The purpose of the experiment is to determine the enthalpy of neutralization reactions by calorimetry. Calorimetry‚ is the science of measuring the amount of heat. All calorimetric techniques are therefore based on the measurement of heat that may be generated (exothermic process) or consumed (endothermic process). The
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Determination of Cations and Anions through Elimination and Confirmation Tests By: Symantha Resendiz Introduction A topic of great importance to all scientists is the identification of compounds‚ which is relevant in all aspects of their work in some way shape or form. Weather it may be determining what is causing sickness or what is polluting the air‚ it is very prevalent in the science world. In project 2‚ identification of cations and anions was preformed through a series of confirmation
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The Spectrophotometric Determination of an Equilibrium Constant. Abstract: The report presents determination of equilibrium constant for the formation of a complex ion FeSCN2+. This was accomplished using a colorimeter to measure absorbance of some known concentration solutions in order to generate the calibration curve. The equation of the graph was used to compute the equilibrium concentrations of the reactants and products‚ needed to calculate the equilibrium constant for
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Strong electrolytes such as NaOH‚ HCl‚ and HNO3 completely dissociate into its component ions in aqueous solutions where else weak electrolytes such as phenol only partially dissociates into ions in aqueous solutions. (Daintith‚ 2010). Experimental Procedure The experimental procedure used for this
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converted to the desired unit‚ milligrams. So‚ to obtain the calibration curve data‚ two students began by preparing two solutions. The first was 100 mL of 1.0 x 10-3 M Fe(NO3)3‚ and the second was 100 mL of 0.10 M KSCN. Both solutions were made in 1.0 HNO3. The former solution was prepared using 0.0404 grams of Fe(NO3)3•9H2O on an analytical balance (calculations below). The latter solution was prepared using 0.97 grams of KSCN on a top loading balance (calculations below). Then‚ 1.0 mL of the iron
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Structure of Matter | | 1. | An element consists of three isotopes in the relative abundance given below. What is the atomic mass of this element? | | 30.00% = 40.00 amu50.00% = 41.00 amu20.00% = 42.00 amu | | (A) | 40.90 | | (B) | 41.00 | | (C) | 41.90 | | (D) | 42.20 | | (E) | 42.90 | | | 2. | The total number of electrons that can be accommodated in the fourth principal energy level is _____ | | (A) | 2 | | (B) | 8 | | (C) | 18 | | (D) | 32 | | (E)
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the solution was added to TT 1 9. 10 drops of 6N ammonium hydroxide was added to TT 2 and 3 10. 6N HNO3 was added to TT 2 11. The precipitate in step 10 was placed in a container Result (data sheet) Discussion Exercise 19 “Qualitative Test for some Cations 1”. For this exercise we obtained 3 test tube‚ each test tube was treated with different reagent (6N HCl‚ hot H2O‚ K2CrO4‚ 6N NH4OH‚ 6N HNO3). TT 1‚2 and 3 with reagent treatment 6N form a white precipitate‚ TT 1 with hot H2O was dissolved
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Information: During this lab nitric acid will be used as an oxidizing agent and (NO2) nitrogen dioxide will form. This gas is extremely toxic‚ and should not be inhaled. A use of a fume hood should be used during the process of adding nitric acid (HNO3) to the solution. Additionally‚ safety goggles should be worn throughout the entire lab. Shoes should be closed toed‚ clothing should cover
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complexing agent) | Green Gel becomes crystalline upon standing‚ Ni(OH)2 | ? | S2- (acidic pH = 0) | Black ppt‚ Ag2S(soluble in hot 6M HNO3) | Black ppt‚ PbS(soluble in hot 6M HNO3) | Black ppt‚ CuS(soluble in hot 6M HNO3) | No ppt | | S2- (basic pH = 9) | Black ppt‚ Ag2S(soluble in hot 6M HNO3) | Black ppt‚ PbS(soluble in hot 6M HNO3) | Black ppt‚ CuS(soluble in hot 6M HNO3) | Black ppt‚ NiS(soluble in hot 12M HCl) | | Perform the Separation/Identification Experiment as follows; • Read through the
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