and potassium thiocyanate‚ KSCN. They react to produce the blood-red complex [Fe(SCN)]2+. Fe3+ + SCN- ( [Fe(SCN)]2+ The equilibrium constant expression may be expressed as: K = [pic] You will prepare a series of standard solutions that contain known concentrations of [Fe(SCN)]2+ and will determine their absorbances at 447 nanometers. The concentrations and absorbance values will be used to construct a calibration graph for [Fe(SCN)]2+. In the second part of the experiment
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movement of water molecules. When observed‚ there are two types to a solution: solute and solvent. The solute is a dissolved substance and the solvent is when the solute is dissolved. When you have more than one solution‚ you compare them to see if they are hypotonic‚ hypertonic‚ or isotonic. Hypotonic is when the other solution in comparison to the solution you are looking at is less solute. Hypertonic is explained as when one solution is more
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until the concentration is equilibrium. There are usually more solvents in the water inside the plant which means there is a high concentration. Because of this‚ the water flows into the root hair cells from the soil. Watering plants with a saline solution (salty water) changes the osmotic potential of the soil. This results to the water surrounding the root more saline than the cell sap within the plant. This causes reverse-osmosis where the nutrients are actually drawn out of the plant and into the
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reduced. You are to plan an experiment to investigate how the boiling point of an aqueous solution of potassium chloride depends on the concentration of the solution. (a) (i) By considering how the vapour pressure changes as the concentration of the aqueous potassium chloride increases‚ predict and explain how the boiling point of the solution will be affected by the concentration of the solution. Predict how the boiling point will change
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incorporated Beer’s Law and is focused on determining the stress that various alcohols have on biological membranes. Using five solutions of differing alcohol concentration for each of the three alcohols; methanol‚ ethanol‚ and 1-propanol and a small slice of beet‚ the stirred solution was placed into a plastic cuvette and then into a spectrophotometer and the absorbance of alcohol solutions were determined in order to conclude which alcohol and concentration of alcohol had the greatest effect on biological
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Directions Using the formula for dilutions‚ write the recipe to make 100 mL of a new solution of each solute based on having as much of the initial solution as you need. V1 M1 V2M2 SoluteFormula of SoluteInitial Concentration (M)Final Concentration (M)Recipe For 100 mL of New SolutionSodium hydroxideNaOH1.0 M0.27 M(1.0M)(VNaOH) (0.27 M)(100 mL) VNaOH 27 mL Dilute 27 mL of 1.0 M NaOH to 100 mL.Potassium permanganateKMnO41.0 M0.34 MDilute 34 mL of 1.0 M
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Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated solution – down the water potential gradient) Note: diffusion and osmosis are both passive‚ i.e. energy from ATP is not used. A partially permeable membrane is a barrier that permits the passage of some substances but not others; it allows the passage of the solvent molecules but not some of the larger solute molecules. Cell
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half-cells. The glass electrode is an ion selective electrode (ISE)‚ which only responds to the hydronium ion concentration / activity in a solution under a large range of conditions. In this experiment‚ we are measuring the fluoride ion concentration‚ which means our electrode responds to fluoride ion concentrations. Procedure And Data: |Standard Solutions | |Concentration (M) |Potential (mV) | |0
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61 grams and the volume decreased by 17.3 milliliters while the mass of the cup with the tubing holding glucose solution also decreased by 1.19 grams and the volume decreased by 2.2 milliliters (Emma Ricks and Allen Hansen). The movement of water into the protein solution bag caused the mass to increase by 7.95 grams and the volume to increase by 2.4 milliliters and the glucose solution bag increased by 1.97 grams in mass and 2.2 milliliters in volume (Emma Ricks and Allen Hansen). The water had a
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Product Constant Q: Write the equilibrium equation for a saturated solution of the following salts and the corresponding solubility product expressions. a) BaSO4 (s) b) MgF2 (s) c) Ag2S (s) d) Cu(IO3)2 (s) [ ][ [ [ A: [ ( Q: ) ] ][ ][ ] ] What is the equilibrium concentration of Cd2+ ions in a saturated solution made by shaking CdS(s) with water? Ksp = 6.0x10-27 for CdS. [ A: [ Q: ][ ] ][ ] ; ][ ] √ √ A solution in equilibrium with a precipitate of AgCl was found to contain 3.4x10-6M
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