Question

**SETUP**

In today’s lab we will measure specific heat using a
**calorimeter**. A calorimeter consist of a small
metal cup inside a larger metal container, with a
lid. The cups are thermally separated from each other by
means of air and a wooden ring, thus reducing the thermal
conduction to a minimum.

To keep track of how much water etc. we have, the whole calorimeter will be placed on a digital scale. Make sure to zero the scale before you place the calorimeter on it.

**PART 1: Initial measurements**

To better understand our setup, we shall do the first part without any metal at all, but just cold and hot water. Please perform the following steps.

**1. mass of the inner cup of the
calorimeter.**

Mass of inner cup: _____ 62 grams _____

Zero the digital scale, and then place by the calorimeter (both cups + the ring + one thermometer) on top of the digital scale.

**2. mass the whole calorimeter**

Total mass calorimeter: ______ 241 grams ________

*Fill the inner cup of the calorimeter with 150 ml of cold water (from the tap in the lab).

**3. mass of the calorimeter + the cold
water.**

Total mass calorimeter + cold water: ______ 392 grams _________

**QUESTION 1****: What is the mass
of the cool water?**

Mass of the cold water: ____________ ___

- Now it’s time to prepare the hot water. Take the 250 ml glass beaker.

**mass of the empty beaker**

Mass of empty beaker: _______ 97 grams ________

- Fill the 250 ml glass beaker with about 150 ml of water.

**mass of the beaker + water.**

Mass of beaker + water: _____ 261 grams ___

**QUESTION 2****: Determine the
mass of the water in the glass beaker.**

Mass of water in beaker: ____________ ___

- Place the beaker with water on the heating plate. Heat the water until its temperature is about 90 °C.

**temperature of the cold water inside the
calorimeter.**

Temperature cold water: _____ 22.1 °C __________

**temperature of the hot water inside the beaker using the
second thermometer. Once you’re done, make sure to remove this
second thermometer.**

Temperature hot water: ________ 90.3 °C _________

- Wear your safety goggles and put the heat-resistant gloves
on. Then pick up the beaker and carefully pour the hot
water into the inner cup of the calorimeter, thus combining the
cold and hot water.

Be careful not to cause any splatter!! - Witness the temperature of the inner cup rise, as the cold water mixes with the hot water.
- After a while, the mixture will reach its highest temperature when it’s at thermal equilibrium. Record this temperature in the question below.

**maximum temperature of the cold/hot water
mixture**

Temperature of cold+hot water mixed: ________ 55.7 °C _________

**new mass of the calorimeter including all the
water.**

Total mass calorimeter + cold water + hot water: _____ 551 grams ___

**QUESTION 4 How much of the hot water went into the
calorimeter? (This ought to be equal to your answer in
Q7, but typically we lose a few grams of water when pouring it into
the calorimeter.)**

Mass of the hot water (added to calorimeter): ____________ ___

Because the inner cup of the calorimeter is made of metal, a significant amount of heat will actually go from the water into this cup. Therefore we cannot ignore the calorimeter.

However, because the specific heat of water is well known to be J/(kg K), it is easy to account for the inner cup of the calorimeter. Shortly after mixing the water, the system (i.e. the water and the calorimeter) will have come to the same temperature . Because the inner cup of the calorimeter is isolated from its outer cup, heat cannot easily escape from the calorimeter to the surroundings. Therefore, the total heat added to the system will be zero:

with

- heat gained by cold water, as it goes from to

- heat lost by the hot water, as it goes
from to

(and because it’s lost, this term should be negative!)

- heat gained by the inner cup, as it goes from to .

**QUESTION 13****: Using the
equation above, together with** **J/(kg K) and all the
measurements you made, determine the specific heat**
**of the inner cup. For full credit, show your
calculations below.**

Specific heat of inner cup: ____________ ___

Answer #1

Heat transfer from solid to liquid:
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In the laboratory a student uses a "coffee cup" calorimeter to
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She measures the final temperature to be
23.20°C.
Assuming that all of the heat is transferred to the water, she
calculates the specific heat of tungsten to
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She heats 19.3 grams of chromium
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She measures the final temperature to be
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Assuming that all of the heat is transferred to the water, she
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How does the temperature and specific heat capacity of a sample
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We just determined our "calorimeter constant." We now have to re-do
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Heat capacity of calorimeter: 41.6 J/gC
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