• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4

# Calorimeter lab. What is the change in enthalpy for magnesium after the reaction with vinegar?

Extracts from this document...

Introduction

﻿Introduction: The first law of thermodynamics states the total energy of an isolated system cannot be created or destroyed. Since chemical energy is the sum of heat plus work many chemical reactions involve the evolution of heat or production of work. An example is a car engine that converts the chemical energy stored in gasoline into heat and work. This heat that is exchanged can be measured with an apparatus called calorimeter. A calorimeter is an insulated vessel preventing the heat from escaping into the surrounding. The thermometer is used to measure the temperature change and the stirrer is used to ensure the heat is uniformly distributed. ...read more.

Middle

The apparatus was moved to the front of the class where the teacher set up the thermometer attached to the laptop showing the temperature. A Styrofoam cup with two holes for the thermometer and another for the stirring rod was set up and was placed on top of the apparatus as tightly as possible so not a lot of the gas can escape. The initial temperature was measured using the thermometer. The top was removed, the magnesium was added and quickly the top was placed back on to the top. The stirring rod was used to mix the solution inside the calorimeter. The thermometer connected to the computer showed the temperature increase and decrease as a graph. ...read more.

Conclusion

mol ΔH = -Q ÷ nmg = -2366.4704 J ÷ 0.0082 mol = -288.59 kJ/mol The change of enthalpy is -288.59 kJ/mol for the magnesium. Conclusion The hypothesis was right because the change of enthalpy of the magnesium is -288.59 kJ/mol. A lot of heat is released from this reaction. 0.2 g of magnesium was used with 20.0 mL of vinegar. The initial temperature of the calorimeter was 24.7 °C and the finial being 52.7 °C. The magnesium reacts with vinegar (CH3COOH) because of the oxygen present. The reactivity of the magnesium increase as the oxygen level increases. This single displacement reaction of the magnesium and the vinegar reacts and forms hydrogen gas. Reference: Biology 12. Toronto: McGraw-Hill Ryerson, 2011. Print. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Organic Chemistry section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Organic Chemistry essays

1. ## Find the enthalpy change of combustion of a number of alcohol's' so that you ...

16.8 0.066956521 250.91 Propan-1-ol (1) 16.8 0.034333333 489.32 Propan-1-ol (2) 16.8 0.035 480.00 Propan-1-ol (3) 16.8 0.0405 414.81 Butan-1-ol (1) 16.8 0.020675675 812.55 Butan-1-ol (2) 16.8 0.040405405 415.79 Butan-1-ol (3) 16.8 0.023783783 706.36 The table shows the average enthalpy change of combustion Name of Alcohol Average mass of fuel used (g)

2. ## The aim of this experiment is to produce Aspirin. This is an estrification in ...

Percentage error = 0.05 x 100 = + 0.3067% 16.3000 Total percentage error = 0.0165 + 0.24 + 0.3067 = + 0.5632% By working out the total percentage error, the confidence limit can be calculated. Actual weight of aspirin = 0.2934g Total % error = 0.5632% 0.5632% of 0.2934g = 0.0165 (0.05632 x 0.2934)

1. ## The aim of this experiment is to investigate the enthalpy change of combustion for ...

I feel could have been a build up of soot on the under side of the calorimeter which meant that the carbon was not fully combusting in carbon dioxide and would not have been accounted for in the results. Reasons such as a draught in the room caused by movements of the other pupils could have had some effect etc.

2. ## investigating the amount of ascorbic acid present in fruit

Now that I have worked out the mg of vitamin C in the titrated sample of orange, lime and lemon I will now work out the mg of vitamin C of the fruit by relating to the mg of vitamin C present in 10.00 cm3 of the fruit sample that was used.

1. ## Comprehensive and Detailed Chemistry notes

needed to grow the crops needed for production of ethanol which will result in loss of native forests. Australia lacks this arable land. -- Ethanol can only be used as a 10-15% blend with petrol. Any higher proportion of ethanol would require engine modifications which are very expensive.

2. ## Determination of the Enthalpy Change of a Reaction

This can described in the form y = mx, m being the gradient of the rate of temperature increase in respect to mass of reagents present. Standard deviation will give us an indication as to the accuracy of the results.

1. ## Comparing The Enthalpy Change OfCombustion Of Different Alcohols

I will not open the spirit burner (to refill) in the laboratory with naked flames. 4. The apparatus will be hot during and after the experiment and so care should be taken when handling it and I should wait until the equipment has cooled down sufficiently before moving it Preliminary work Method 1.

2. ## Compare the enthalpy changes of combustion of different alcohols

above and set up appropriately as I will show in a diagram. 2) When collecting the calorimeter, place on the electronic balance of accuracy to 2 dp, and make sure it has been set to zero. I will then pour water using a measuring cylinder into the calorimeter until the mass of water reaches 250g.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to