• 1x hot plate
• 1x electronic scales
• 4x 100mL beaker
• 4x glass stirring rod
• 4x thermometer
• 1x chemical spatula
• 500mL of deionised water
• 500g of sugar (sucrose – C12H22O11)
• 100g of salt (NaCl)
• 100g of copper sulphate pentahydrate (CuSO4•5H2O)
1. Fill a 100mL beaker with 50mL of water and then weigh it using electron scales and take note of the mass. Place the beaker on the hot plate, but don’t turn the hot plate on.
2. Place a thermometer in the beaker of water…
1. Two solutions, A. being 1.0 x HCl, and B. being 0.10 M will be given, as well as buffer solution 1 M NaOH.
2. Have 25 mL of solution A. and B. in two separate beakers.
3. Check the pH of both solutions without any NaOH first. Then begin checking pH after 1 drop, then after 10 drops, and lastly 25 drops. After each set of drops be sure to mix solutions.
4. Compare both sets of pH to determine which had an easier time resisting change.
C. Titration curves.
1. Insert NaOH into…
In this experiment I have compared three different methods of determining the amount (percentage) of ethanol present in an aqueous sample. I tested three different samples containing different percentage amounts of ethanol in them; Listerine, Terra Fresca Wine and the last is a mixture of ethanol and water that was made by me. The three different methods compared are the redox titration method which involves the oxidation of ethanol to ethanoic acid and then titrating the residue with…
5. Proposed Research Questions and Tasks
Four proposed research tasks will direct to fabrication conditions (Task 1), fabrication thermal analysis (Task 2), fabricated parts performance (Task 3), microstructure control methodology (Task 4), respectively. These tasks are designed to answer the questions and solve the problems in the results of preliminary experiments and observations from reported investigations.
5.1. Task 1. Investigating feasible formation conditions and effects of laser power…
In order to safely dispose of a solution with a pH of 12, the solution needs to be diluted with an acid to neutralize the basic solution. The pH range should be between 5 to 8 to be ready for disposal.
2. A graduated cylinder, Erlenmeyer flask, and beaker were used to measure a 60-mL volume. Which of these devices seems to be the most accurate for measuring a 60-mL volume? Be sure to explain what the term ‘accurate’ means. How did you determine this during lab? State some reasons why this…
The purpose of this experiment was to determine the identity of nine solutions using the results of reacting pairs of solutions in an organized systematic manner. Known solutions were used on the first day. The second day, the solutions were placed in code-labeled bottles. The reactions from the previous day were then used to help identify which solutions were which, by closely monitoring which unknown solutions mixed with other unknowns and how they reacted, such as: color changes,…
The purpose of this experiment was to calculate the percent yield of copper after conducting series of chemical reactions. To study the % yield of copper in the copper cycle, the initial mass and final mass of copper was measured. The chemical reactions involved in the copper cycle are dissolution, precipitation, dehydration, and oxidation/reduction. First, copper was reacted with in a beaker to form (aq) and . The purpose of the dissolution reaction is to convert the copper into solutes in…
Calorimetry is the measurement of heat flow. In our lab the Calorimetry measures the amount of heat flow needed to increase or decrease the temperature of the cold or hot packs. A Calorimeter coffee cup is used because allows for constant pressure while also measuring the change of heat…
Repeat steps 4-7 using ethanol and propane.
14. Calculate the molar heat to measure the change in temperature when substances dissolve in water using the formula ∆H=mC∆T.
Calorimetry experiment or method is the process of measuring the amount of heat released or absorbed throughout a chemical reaction. By knowing the change in heat, it can be determined if a reaction is exothermic or endothermic.
Some substances dissolve in…
calorimeters are a coffee cup calorimeter (calorimetry with a constant pressure) and a beaker with a flame under it is known as simple calorimeters. Specific heat (C) is the amount of energy an object absorbs before the temperature changes. The temperature changes by how much mass there is in an object. The mass of an object depends on how much heat is needed for temperature change. Enthalpy (H) is the amount of energy that absorbs or leaves a system. Calorimetry is the science of measuring…