become: K = [Na+]2 [B4O5(OH)42-] The first equilibrium expression and the balanced solubility equilibrium reaction allow us to express either borate ion or sodium ion in terms of the other. So‚ it is possible to determine the constant in terms of either ion. After substituting borax ion in place of the sodium ion‚ ([Na+] = 2 [B4O5(OH)42-] ‚ K = (2 [B4O5(OH)42-] )2 * [B4O5(OH)42-] ) we get: K = 4 [B4O5(OH)42-]3 . Finding the concentration of borate ion in any sample
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experiment involved the preparation of the working standard Cu(II) solution of specific concentration from CuSO4•5H2O. A standard sodium thiosulfate (Na2S2O3) solution was also prepared to serve as the titrant for the analysis. Proper handling should be administered for this solution since it decomposes into its component ions when it is exposed to acids‚ light‚ and bacteria. Sodium carbonate was added to the solution to act as a preservative. Boiled distilled water was also used in dissolving the crystals
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Paraphrasing 1. What is paraphrasing? - A (more or less) free rewording of an expression or text‚ as an explanation‚ clarification and translation. “Paraphrasing‚ or translation with latitude‚ where the author is kept in view…but his words are not as strictly followed as his sense” (John Dryen‚ preface to his translation of Ovid‚ 1680) - An act or result of rewording (Ex. Simplified version of a legal document) - To make a paraphrase: to translate or define loosely
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1_________________ 14. How do the total masses of the reactants and products compare?______________equal_________________ Section 11.1 continued In your textbook‚ read about mole ratios. Answer the questions about the following chemical reaction. sodium iron(III) oxide → sodium oxide iron 6Na(s) Fe2O3(s) → 3Na2O(s) 2Fe(s) 15. What is a mole ratio? A mole ratio is a ratio
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active transport of sodium potassium pumps will decrease dramatically due to the lessened concentration of pumps. If the same transport was run without ATP. it would not work‚ hence justifying that it is not simple diffusion‚ and rather was active transport‚ which requires the use of ATP. No‚ because the two substances are the same in each beaker‚ causing no effect on Na+ transport as they are at equilibrium. The rate of ion transport would increase when the number of sodium-potassium pump proteins
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PRACTICAL 2: Preparation of sodium hexanitrocobaltate (III) Date: 12 March 2014 INTRODUCTION Sodium hexanitrocobaltate (III) is a coordination complex which has the formula Na3[Co(NO2)6]. This compound is yellow in colour. It consists of a central Co3+ ion surrounded by six nitro ligands [1]. This compound is used as a qualitative test for potassium and ammonium ions (so long as certain other cations are not present) [1]. Potassium and ammonium are insoluble in water‚ while sodium is [1]. Hence‚ the
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Question 1 (Limiting Reagent) 15.00 g aluminum sulfide & 10.00 g water react until the limiting reagent is used up. [Atomic mass: H = 1.008‚ Al = 26.98‚ S = 32.07‚ O = 16.00] Here is the balanced equation for the reaction: Al2S3 + 6 H2O ( 2 Al (OH)3 + 3 H2S (i) Which of the two reactants is the limiting reagent? (ii) What is the maximum mass of H2S which can be formed from these reagents? (iii) How much excess reagent remains after the reaction is complete
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increasing the rate‚ as predicted. 3. It won’t change since the concentrations are the same and the transport proteins are glucose carriers. The rate did not change because sodium chloride doesn’t help nor hinder the diffusion of glucose. Activity 3 1. The pressure will increase due to the increased concentration of sodium chloride. The pressure increased. 2. Neither one requires ATP. Simple diffusion is the movement of a solute from an area of HIGH to LOW solute concentration but osmosis
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For the Barium solution the Paramecium were moving forward for about 41% of the time. When I was observing them they changed direction frequently instead of going forward for most of the time. They were still moving at an average speed. For the Sodium solution the Paramecium were moving forward for about 45% of the time. I was observing them. They changed direction frequently going in a jerking motion and a paranoid state (moving backwards.) They were still going at an average speed. For the Potassium
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there were no bubbles‚ however the substance turned a yellow-white colour after a few minutes. After a longer wait‚ the substance started to precipitate and the liquid started to become more solid. In the third reaction of which Barium Chloride and Sodium Sulphate were mixed‚ bubbles were again visible‚ however there were very few. After a couple of minutes the mixture turned very cloudy‚ into a solid white colour. 10 minutes later‚ the mixture was completely clear and the compounds had very clearly
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