CALORIMETER

NURUL LAILATIS SA’ADAH

Purpose

• Understand the principle of black

• Understand the working principle of the calorimeter

• Determinethe specific heat of solid materials using a calorimeter

Calorimeter is a device used to measure

the amount of calor that is involved in a

change or a chemical reaction. (Wikipedia,

2014)

Basic Theory

The amount of heat absorbed or released by a

substance magnitude

1. directly proportional to the mass of substance

2. directly proportional to the temperature

changes

3. depends on the type of substance

Basic Theory

Basic Theory

Can be expressed mathematically in the form of

equation

ΔQ = m . C . ΔTWith,ΔQ = heat absorbed or releasedm = mass of subtancec = specific heat ΔT = temperatur (C) or (K)

Tools and materials

1. calorimeter complete with a stirrer, and a protective

vessel

2. materials will be determined calorific kind

3. technical sheet

4. small measuring cup

5. various types of metals to be determined calorific kind

6. Heater

7. steam generators

Stepsthe room temperature & the

outside air pressure were

measured

water was heated

until boiling

Determine the heat

capacity of kalorimeter

temperature was

recorded

water was

refrigerated

Temperature was

recorded

hot and cold water was mixed

in the calorimeter (1:3)

Temperature was

recorded

Stepsthe room temperature & the

outside air pressure were

measured

the metal was weighted and

inserted into steam generator

until boil

Determine the specific

heat of metal

Temperature was

recorded

cold water was prepared and

its mass was determined

Temperature was

recorded

Hot metal and cold water

was mixed in the calorimeter

Temperature was

recorded

Observational Data

NO Mass (g) 1st Temperature (C) Final

TemperatureHeat cold heat cold

1 30 90 82 11 25

2 40 120 84 10 25

3 50 150 84 9 24

Determine the heat capacity of the calorimeter

Determine the specific heat of metal

No Type of

metal

Mass (g) 1st Temperature (C)

Metal Water Metal Water Final

1 Brass 67,6

67,6

150

100

93

94

15

12

20

18

2 iron 65,4

65,4

150

100

93

94

10

14

17

20

Observational Data

Data Analysis

C cal =

Ccal1 = 134,51 J/

Ccal2 = 156,14 J/

Ccal3 = 209,25 J/

Ccal1 = 166,67 J/

C metal =

Cpinch beck = 744,375 J/kg

Ciron = 925,1819 J/kg

RE = 29,61 %

RE = 11,64 %

Data Analysis

The greater the mass amount of hot water and

cold water are used, the greater the heat

capacity of the calorimeter, but the temperature

at the end stays the same

DisscussionDetermine the heat

capacity of kalorimeter

Ccal3 > Ccal2 > Ccal1

Substance C (kJ/kg C)

Alumunium 0,900

Iron 0,448

Pinch bech 0,380

Gold 0,126

DisscussionDetermine the specific

heat of metal

Cpinch beck = 744,375 J/kg

Ciron = 925,1819 J/kg

(from) Data Analysis

(Tipler,1991)

Why is different?

Conclussion

• The calor of calorimeter is 166,67 J/C

• The specific heat of pinch beck is 744,375

J/Kg C

• The specific heat of iron is 925,1819 J/kg

C

Incompatibility with the experiment results of the data table is caused by several things

1. Errors in the practicum

2. Less precise calculation

3. Slipshod

4. Performance tools that are not maximal

Conclussion

The end.......