# T . Chart Insert Table Text Shape Media Comment Calculations: Part A (Reaction A) 1. Calculate…

T . Chart Insert Table Text Shape Media Comment Calculations: Part A (Reaction A) 1. Calculate the mass of the solution from Part A, m by subtracting the dry mass of the calorimeter and stir bar 25.32g . Calculate the temperature change in Part A, ATA = T-TA 4.6°C . Calculate the heat gained by the solution in Part A, 4. = m.c.ATA. Convert your final answer to units of kJ. (We will assume that the specific heat of the solution is equal to the specific heat of water because the solution is almost all water. e- 4.184 loc) Calculate the moles (n) of NaOH that reacted from the mass of NaOH used in Part A. Determine the heat evolved per mole af NaOH for Part A (kJ/ AH, mol). MA 1,382 words NATOKAT al Chart Comment T Insert Table Text Shape Media calorimeter with lots of water and return it to the prep table. Data: Watch: Calorimetry Lab 09 – Calorimetry – Data Collection Dry mass of calorimeter with stir bar: _85.62g Table 1. Data for Part A (Reaction A) Mass of NaOH. (8) Initial Temperature (TA) (C) Final Temperature (TP) (°C) Mass of calorimeter with stir bar and solution (g) 0.56g 25.1°C 29.7°C 110.94g Table 2. Data for Part B (Reaction B) 25.2°C Initial Temperature (T) (°C) Final Temperature (T) (C) Mass of calorimeter with stir bar and solution (g) 28.6°C 135.47g Table 3. Data for Part C (Reaction C) Mass of NaOH. (B) Initial Temperature (T) (°C) Final Temperature (T) (C) Mass of calorimeter with stir bar and solution (g) 0.49g 24.8°C 30.0°C 135.65g 1,382 words MACBOOK AIR T Insert Table Chart Text Shape Media Comment Skin contact with liquid is corrosive and causes severe burns. The severity of injury depends on the concentration of the solution and the duration of exposure. Procedure: Part A. Heat of Solution (reaction A) 1. Measure and record the dry mass of your calorimeter with the stir bar. 2. Accurately measure the mass of approximately 0.50 g of sodium hydroxide pellets (0.40 to 60 g measured to +/- 0.01 g) and add it the calorimeter. CAUTION: Do not handle the pellets, except with a spatula or forceps. Clean up any spills. DO NOT place the NaOH directly on the metal pan of the balance 3. Measure 25.00 mL of deionized water at room temperature using a 50ml graduated cylinder. Use a temperature probe to record the initial temperature, Tai 4. Carefully, transfer water and the temperature probe to the calorimeter. Carefully stir the water/ NaOH mixture and observe the temperature changes. 5. Record the highest temperature observed while the dissolving progresses. This is Tir 6. Measure and record the mass of the calorimeter with the stir bar and the solution in it. 7. Save the solution for Part B. Part B. Heat of Neutralization (reaction B) 8. Measure 25.00 mL 0.75 M HC] (the HC/ will be in excess in these reactions). 9. Allow the NaOH solution in the calorimeter and the HCl(aq) to reach the same temperature. To avoid contamination of the solutions, rinse the temperature probe with water after each use. When the two solutions have reached the same temperature record this value as Tai 10. Pour the HCl(aq) into the NaOH solution in the calorimeter and stir. Record the highest temperature reached before the solution begins to cool, Tar 11. Measure and record the mass of the calorimeter with the stir bar and solution in it. 12. Dispose of the products down the drain with lots of water. Rinse the containers with water in preparation for Part C. 2 1,382 words