Need help designing a lab to calculate delta H?

[RockenNS42]

Homework Statement

I have to design a lab to calculate the delta H value of the enthalpy change of ice to liquid water. It has to stay at 0*C

Homework Equations

Needs to be in lab format but possible q=n(delta H) where n is the molarity

The Attempt at a Solution

I know the energy need to melt one mole of water is 6.02 KJ (oh so my Chem teacher tells me). I know that the energy need to heat up water increases until it hits 0*C then it plateaus until all the ice has melted, then it starts to increase again. What I'm not sure of is how to prove that the energy need is 6.02 KJ per mole.

 

[Borek]

What will happen if you mix known mass of water of known temperature with known mass of ice? What are possible outcomes? Which ones fit your problem?

 

[Blueshift5]

To design a lab to calculate delta H, here are some steps you can follow:

1. Materials and Equipment: The materials and equipment you will need for this experiment include ice cubes, a thermometer, a beaker, a hot plate, a graduated cylinder, and a stopwatch.

2. Setup: Fill the beaker with ice cubes and add just enough water to cover the ice. Place the thermometer in the beaker and record the initial temperature. Place the beaker on the hot plate and turn it on to the lowest setting.

3. Data Collection: As the ice melts and the water starts to heat up, record the temperature every 30 seconds until all the ice has melted and the water reaches a temperature of 0°C. Record the final temperature.

4. Calculation: Use the equation q = n(delta H) to calculate the enthalpy change (delta H) of the ice melting. In this equation, q represents the heat gained or lost, n represents the number of moles of water, and delta H represents the enthalpy change. To calculate n, you will need to know the molarity of the water. You can calculate the molarity by dividing the mass of water by its molar mass. The molar mass of water is 18 g/mol.

5. Analysis: Compare your calculated value of delta H to the known value of 6.02 kJ/mol. If your values are close, then your experiment was successful.

6. Sources of Error: In your lab report, make sure to discuss any sources of error that may have affected your results. Some possible sources of error could include heat loss to the surroundings or inaccuracies in measuring the temperature.

Overall, this lab design will allow you to calculate the delta H value for the enthalpy change of ice to liquid water at 0°C. Make sure to follow standard lab procedures and safety precautions while conducting this experiment.