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    anions tests

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    EXPERIMENT TWENTY Qualitative Analysis of Anions Analysis of Solutions Containing the Ions Cl-‚ Br-‚ l-‚ SO42-‚ CO32-‚ and NO3- This experiment continues the qualitative analysis begun in Experiment 19. Here we will be analyzing solutions to determine the presence of anions. The same techniques that were used for the cation analysis must be used for the anions. If you have not carried out Experiment 19‚ read the introductory section before starting this experiment. The major difference

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    8/14/2013 Complex Ion Equilibria • The dissociation of complex ions can be represented similarly to equilibria. Simultaneous Equilibria: Solubility Product Constants and Complex Ion Equilibria → Ag + + 2 NH Ag(NH3 ) +2 ← 3 [Ag ][NH ] = [Ag(NH ) ] 2 + Kd 3 + 3 2 → Cu 2+ + 4 NH Cu(NH 3 ) 24+ ← 3 [Cu ][NH ] = [Cu(NH ) ] 4 2+ Kd Complex Ion Equilibria 3 2+ 3 4 3 Complex Ion Equilibria • A metal ion coordinated to several neutral molecules or anions forms compounds called complex ions

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    which contain replaceable hydrogen. This is because when the hydrogen is replaced they are acting like an acid. E.g. sodium hydrogen sulphate (NaHSO4). •The method chosen to prepare a salt depends on its solubility. •Solubility depends on the combination of positive and negative ions. SOLUBILITY RULES SOLUBLE INSOLUBLE 1 All nitrates All carbonates except for sodium‚ potassium and ammonium carbonates 2 All chlorides except for silver chloride and lead (ii) chloride All sulphides except for

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    Experimental The chloride ion (Cl-) is an important anion found in solids and solutions. In this experiment‚ the amount of chloride ion in an unknown sample J (NaCl + KCl mixture) of water using the Mohr method is determined‚ which relies on the solubility differences of two anions and the titration endpoint of a precipitate. The net ionic reaction during the titration is as follows: Ag+ + Cl- → AgCl(s) The Ksp for AgCl is 1.8 x 10-10 and that for Ag2CrO4 is 1.2 x 10-12. Thus‚ as

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    (making up the precipitate) should be considered. In gravimetric analysis‚ relatively few crystals are preferred over many small ones. Experimentally‚ it is found that particle size is affected by experimental variables such as precipitate solubility‚ reactant concentrations in the precipitating solution‚ the rate of addition and mixing of reactants‚ and the temperature. Mathematically‚ it is reflected in the Von- Weimarn equation‚ which states that R=Q-SS

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    CHEM2L Activity 1

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    I. DISCUSSION: Differences between organic and inorganic compounds based on structure‚ type of bond and some common physical and chemical properties. II. PROCEDURE: A. SOLUBILITY 1. To 2 mL. each of the following solvents: water‚ ethyl alcohol and ether‚ add a pinch of benzoic acid and shake.

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    experiment as if all 3 compounds are present. In this particular experiment‚ the compounds are benzocaine‚ salicylic acid‚ and naphthalene. An appropriate organic solvent is used to create the ether phase. Diethyl ether is used because it has low solubility in water but will dissolve the components of the mixture (creating liquid layers)‚ is not acidic or basic‚ is less dense than water‚ and can be easily removed by evaporation. To begin the separation‚ the student needs to produce a salt that is water-soluble

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    The objective of present study was to prepare a novel stable Fluorometholone ophthalmic Nanosuspension which has advantage over conventional ophthalmic suspension such as blurred vision‚ burning‚ stinging and irritation upon instillation. The viscosity was increased to provide additional advantage of long duration of action. Precipitation method was used to prepare Fluorometholone ophthalmic Nanosuspension. The type of polymer and stabilizer used showed effect on the particle size and zeta potential

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    Solubility of CO2 in water Aim: To decarbonate a bottle of soft drink and find out the amount of CO2 in the drink. * Principle: The reaction between carbon dioxide and water is an example of an equilibrium reaction: Materials: * * 3 soft drink bottles (300ml) * 6g of salt (NaCl) * Triple beam balance scale * Thermometer * Digital scale * Watch glass * Electric hotplate Method: Standing up method 1. An unopened bottle of carbonated drink

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    Charles Michael Te Herrera Date Performed: November 18‚ 2010 2009 – 14077 Ma’am Rea Abuan Experiment # 1 SOLUBILITY OF ORGANIC COMPOUNDS State what types of intermolecular forces are present in solutions formed due to intermolecular attractions between the solute and the solvent. Compound 1 Compound 2 Intermolecular Forces Class S (Water-soluble) Compounds Acetone Water Hydrogen Bonding & London Dispersion Forces Diethyl Ether Dipole – Induced

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