abortion
To: Director
City Forensics Laboratory
From:
Chem. Section
Subject: Sanitation Worker Accident
Date:
Stoi 903 The analysis for experiment four: Stoi 903was conducted by Me (name) and my partner (name). They analysis performed for experiment four: Stoi 903 took place at Texas State University- San Marcos in room 117 of the chemistry building. The concentrations used in the experiment were both .5 M sodium hypochlorite and sodium thiosulfate. The concentrations of the solutions found in the dumpster were calculated to be .806 M (both sodium hypochlorite and sodium thiosulfate as well). This was found by taking the 6.0% (by mass) sodium hypochlorite and multiplying it by 1 gram of solution, 1000 mL and 1 mol NaClO. This result was then divided by the result of 100g of solvent, multiplied by 1 mL of solution and 1L which equals 60g NaClO. 60g was then divided by the molar mass of NaClO (74.44) which equals .806 mol NaClO. The same can be done for sodium thiosulfate which results in the same molarity. The method used for the experiment is known as method of continuous variations, also called job’s methods. Continuous Variations are a technique used for the determination of the concept of stochiometry of reactants in reaction. The way Job’s Method works is that it finds the certain ratio of two or more chemicals reacting to form a product. In this case the reacting chemicals were sodium hypochlorite and sodium thiosulfate. The stoichiometric ratio was found by using 25mL of both sodium hypochlorite and sodium thiosulfate. The experiment was then performed by trying different combinations of the reactants while recording the change in temperature to determine which combination created the biggest reaction. In this case, 6.0mL sodium thiosulfate and 19.0mL sodium hypochlorite proved to create the most reaction, resulting in a1 to 3 ratio of sodium thiosulfate to sodium hypochlorite. When conducting the experiment a total of eight reactions were
City Forensics Laboratory
From:
Chem. Section
Subject: Sanitation Worker Accident
Date:
Stoi 903 The analysis for experiment four: Stoi 903was conducted by Me (name) and my partner (name). They analysis performed for experiment four: Stoi 903 took place at Texas State University- San Marcos in room 117 of the chemistry building. The concentrations used in the experiment were both .5 M sodium hypochlorite and sodium thiosulfate. The concentrations of the solutions found in the dumpster were calculated to be .806 M (both sodium hypochlorite and sodium thiosulfate as well). This was found by taking the 6.0% (by mass) sodium hypochlorite and multiplying it by 1 gram of solution, 1000 mL and 1 mol NaClO. This result was then divided by the result of 100g of solvent, multiplied by 1 mL of solution and 1L which equals 60g NaClO. 60g was then divided by the molar mass of NaClO (74.44) which equals .806 mol NaClO. The same can be done for sodium thiosulfate which results in the same molarity. The method used for the experiment is known as method of continuous variations, also called job’s methods. Continuous Variations are a technique used for the determination of the concept of stochiometry of reactants in reaction. The way Job’s Method works is that it finds the certain ratio of two or more chemicals reacting to form a product. In this case the reacting chemicals were sodium hypochlorite and sodium thiosulfate. The stoichiometric ratio was found by using 25mL of both sodium hypochlorite and sodium thiosulfate. The experiment was then performed by trying different combinations of the reactants while recording the change in temperature to determine which combination created the biggest reaction. In this case, 6.0mL sodium thiosulfate and 19.0mL sodium hypochlorite proved to create the most reaction, resulting in a1 to 3 ratio of sodium thiosulfate to sodium hypochlorite. When conducting the experiment a total of eight reactions were