cover slip. The paper should draw out the water and draw in the salt solution. 4. Observe the effects of the saline (salt) solution on the onion cells. Make a properly labeled‚ careful drawing of the cells’ appearance. 5. Replace the sodium chloride (NaCl) solution with distilled water in the same way that the salt solution was added. Make a properly labeled drawing of the cells’ appearance in the space provided. Answer the following questions: 1. Draw a diagram to indicate
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The moles of sodium thiosulphate can be determined using the average titre values and its concentration. When calculating the average titre values‚ the outliers are ignored because they are mainly created by errors and their great difference from the titres achieved in other trials will pose a great impact to the accuracy of the final result. n=v × c Where ‘n’ is the moles of sodium thiosulphate‚ ‘v’ is the average tire values sodium thiosulphate‚ and ‘c’ is its concentration
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Material and Methods * Osmosis : -thistle funnel tube -dialysis tubing sack -saturated NaCl w/food coloring -beaker with distilled H2O The experiments begins with the construction of a simple osmometer by obtaining pre-soaked length of tubing ‚opened and tied at the end. The tube is filled with saturated NaCl solution (with added food coloring) and the thistle is inserted in the dialysis tubing. The dialysis tubing is sealed to the thistle funnel with dental floss and placed in a beaker
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Standardization of hydrochloric acid by sodium carbonate Concentrated hydrochloric acid is roughly 11 M. Pour out into a measuring cylinder about 2 cm3 of concentrated hydrochloric acid. Transfer it to a 250 cm3 flask and make up to the mark with water. Shake well. Put some pure sodium hydrogen carbonate or anhydrous sodium carbonate into an evaporating dish and heat gently over a low flame for about fifteen minutes‚ stirring continuously. Take care not to heat the mass too strongly or fusion
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Chemistry Write-Up The Thermal Decomposition of Sodium Hydrogen Carbonate Aim: When Sodium Hydrogen Carbonate (NaHCO3) is heated‚ Carbon dioxide and water are given off to leave a white powder. The aim is to find the equations for this reaction. Hypothesis: The experiment will prove which of the equations below is true. It will tell us whether Sodium Carbonate is produced or Sodium Oxide. 2NaHCO3 Na2CO3 + CO2 + H2O 2NaHCO3 Na2O + 2CO2 + H2O Variables: Independent: Original
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and the sodium hydroxide. When using glassware in experiments‚ it must be flushed out to make sure that cross contamination does not happen and that the only thing that would then be coating the beaker is the distilled water. When all of the glassware has been cleaned‚ some sodium hydroxide should be placed in a plastic weighing boat next to the scales and place the second weighing boat on the scales and weigh it then click the on tare button to set it back to zero and weigh out 1g of sodium hydroxide
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activity of sodium butyldithiocarbamate pentahydrate‚ C5H20NNaO5S2 Ayodele T. Odularu a‚ Peter A. Ajibade a‚ Bolhuis‚ A. b a. Department of Chemistry‚ University of Fort Hare‚ Private Bag X1314‚ Alice 5700‚ South Africa. b. Department of Pharmacy and Pharmacology‚ University of Bath‚ United Kingdom. Abstract Synthesis of sodium butyldithiocarbamate pentahydrate‚ C5H20NNaO5S2‚ entailed a one-pot synthesis. The process of synthesis involved the use of butyl amine‚ carbon(IV) sulfide and sodium hydroxide
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Sulfate Steven English Lab Instructor: Dr. Campo Date: Tuesday‚ February 5th 2013 Pre-Lab Questions A. Adding the acid to the sodium sulfate solution results in an increase in the solubility of any free anions present in the sample. This will happen because the present anions will bind with the hydrogen cations present in the acid. B. The sodium sulfate is boiled because experiments have shown that barium sulfate is 50 times more soluble at 100°C than at room temperature. At the higher
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Stephanie Thao Chemistry 1151 Laboratory Analysis of acid by titration with sodium hydroxide Ms. Hoang November 2012 Introduction: The purpose of this experiment is to demonstrate an example of how to determine the unknown molarity of hydrochloric acid by titration with a base (sodium hydroxide). Titration is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte (wekipedia). The first step will be measuring
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Enclosures: (1) Data Record (2) Data Treatment (3) Environment Impact Research After hours of vigorous examination‚ we have come to the conclusion that calcium chloride (CaCl2) would be the best deicer to use on a naval base over sodium chloride (NaCl) and ethylene glycol (C2H6O2). In order to melt ice‚ deicers lower the freezing point so that the ice melts at lower temperatures. CaCl2 has a freezing point depression of 5°C‚ whereas NaCl has only a 3°C depression‚ and ethylene
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