October 17 & October 24‚ 2012 How is Aspirin Made? This lab is about synthesizing aspirin using a hotplate to heat the reaction. It involved vacuum filtration‚ recrystallization‚ and comparing the properties of aspirin with salicylic aspirin. The first thing we did in this lab was make a hot-water bath by putting a beaker with water on a hot plate. After measuring out 2.1 grams of salicylic acid and 3 ml of acetic anhydride‚ we mixed the two together‚ along with 3 drops of sulfuric acid. We
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Gravimetric Analysis of CA2+ as CaC2O4.H2O Introduction Weight determination represents one of the most accurate and precise form of measurement carried out in lab analysis. Thus‚ gravimetric analysis provides a great assay of a variety of analytes. Mixtures of compounds in difference phases provide us with one of the simplest methods of separation and mass explorations. Separating a solid mass from a liquid involves the commonplace
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In the second separation of this experiment‚ the Erlenmeyer flask with the first filtrate was put into a beaker so the filtrate was in the beaker. The beaker was then heated on a hotplate until near boiling. After the whey protein had precipitated‚ a vacuum filter was used to filter out the whey. These proteins were then air-dried. A qualitative test was done to indicate that the sample extracted was the protein whey. Again‚ a small test tube was used and 2 mL of protein test solution was put in
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The true story tells us of the young woman‚ Celie‚ and her hardships. From a young age she was repeatedly abused by her step-father and was then forced into an abusive marriage‚ jumping out of the fry pan and into the hotplate. Celie is isolated from her sister Nettie and her 2 children; her only support networks and writes to God as a way of overcoming her harsh conditions‚ until Shug Avery enters her life. Shug‚ an outspoken and free woman inspires Celie to rise above
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Procedure: 1. Half fill one 400mL beaker with tap water. Add a few boiling chips and turn on the hotplate to the highest temperature setting or if your lab is equipped with burners light the burner. Bring the water to a boil and then turn the heat down so that the water continues to boil. 2. Put 150mL of tap water into a second beaker and add ice to
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Title Investigation of the suitability of indicators and instrumental detection of equivalence points in acid-base titration. Objective 1. To understand the importance of choosing suitable indicators for detecting the end points of acid-base titrations. 2. To obtain titration curves for some acid-base titrations. Materials and Method (Please refer to the General Chemistry BPH2012 practical manual pg 4-5) Results Part I: Suitability of Indicators A.Strong acid-weak base titration
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down the cracker quicker‚ resulting in the colour change into a orange. Finally‚ the boiled test tube will also turn orange faster than the one at room temperature because the boiling water will speed up • 4 test tubes labeled 1-4 • hotplate • stirring rod • test tube rack/stand 1. Four test tubes were placed in a stand and labeled #1-4 with masking tape 2. The first test tube was half filled with water only 3. The second test tube was about one-quarter filled with saliva
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The process of distillation is commonly used to purify liquids. The process of distillation allows separation of distillates based on the temperatures at which they boil. Liquids with higher volatility boil at lower rates than liquids that are less volatile. Because of this when a mixture of two substances is created there will be a spike in the boiling point. At the spike the more volatile substance has vaporized and condense out of the mixture leaving the less volatile liquid. Thus the temperature
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QCalorimeter] which translates into (mcΔT)Substance = - [(mcΔT)Water + (CΔT)Calorimeter] Materials: Coffee-cup calorimeter Water Safety Goggles Thermometer Lab Apron Ringstand Tongs Clamp Graduated Cylinder Test tube Unknown Metal Sample Hotplate Triple Beam Balance (or other mass measuring equipment) 600 ml Beaker Procedure: 1. Follow all safety guidelines prior to starting. Clear lab station. Gather all materials. 2. Set up the coffee-cup calorimeter as shown in the previous
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Zimbabwe Retail Sector: A look at some of the challenges presented by good economy growth. By Girland Chibaya A recent Economic Report for Africa mentioned that Zimbabwe is now ranked among the top 10 economic performers in Africa. While this is good news‚ what does this mean especially to those South African retail companies that are looking into investing in the country. A recent trend has shown that most retailers are starting to pay more attention to store growth to both South Africa and Sub-Saharan
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