धातुओं की विशिष्ट ऊष्मा क्षमता

एल्युमीनियम, तांबे और लोहे की ऊष्मा क्षमताओं की तुलना

Thermochemistry Intermediate (High School) 40 मिनट ~$10.00

उद्देश्य

मिश्रण विधि का उपयोग करके कई धातुओं की विशिष्ट ऊष्मा क्षमता निर्धारित करें और स्वीकृत मूल्यों से तुलना करें।

पृष्ठभूमि

The specific heat capacity of a metal can be determined by heating a known mass of metal to a known temperature, then transferring it to water in a calorimeter and measuring the temperature change. Energy conservation (q_metal = -q_water) allows calculation of the metal's specific heat.

सुरक्षा चेतावनियाँ

  • Hot metals and boiling water — burn risk
  • Use tongs to transfer hot metals
  • Do not touch hot metals with bare hands

आवश्यक PPE

goggles lab_coat

सामग्री

  • Metal samples (Al, Cu, Fe) (50 g each)
    Cylindrical pieces work best
  • Distilled water (300 mL)
  • Boiling water (500 mL)
    For heating metals

उपकरण

Polystyrene cup calorimeter Beaker (600 mL) Hot plate Thermometer (2) Analytical balance Tongs String

प्रक्रिया

1

Weigh each metal sample accurately. Record masses.

3 मिनट
2

Place all metals in boiling water for 10 minutes to reach 100°C.

12 मिनट Handle hot water carefully
3

Add 100 mL room-temperature water to the calorimeter. Record initial temperature.

2 मिनट
4

Using tongs, quickly transfer the aluminum sample to the calorimeter. Stir and record max temperature.

5 मिनट Hot metal — use tongs
5

Calculate c(Al) = m(water)×c(water)×ΔT(water) / [m(Al)×ΔT(Al)].

5 मिनट
6

Repeat steps 3-5 for copper and iron.

15 मिनट
7

Compare measured values with accepted: Al=0.897, Cu=0.385, Fe=0.449 J/g°C.

5 मिनट

अपेक्षित परिणाम

Aluminum should give the largest temperature rise in the water (highest specific heat), followed by iron, then copper. Measured values should be within 10-20% of accepted values.

सफाई

Allow metals to cool completely. Dry and store. Pour water down the drain. Clean calorimeter.

Frequently Asked Questions

What is the objective of धातुओं की विशिष्ट ऊष्मा क्षमता?
मिश्रण विधि का उपयोग करके कई धातुओं की विशिष्ट ऊष्मा क्षमता निर्धारित करें और स्वीकृत मूल्यों से तुलना करें।
How difficult is धातुओं की विशिष्ट ऊष्मा क्षमता?
This experiment is rated as Intermediate (High School). It takes approximately 40 minutes to complete.
What safety precautions are needed for धातुओं की विशिष्ट ऊष्मा क्षमता?
Key safety precautions include: Hot metals and boiling water — burn risk; Use tongs to transfer hot metals; Do not touch hot metals with bare hands.
What materials are needed for धातुओं की विशिष्ट ऊष्मा क्षमता?
The main materials required are: Metal samples (Al, Cu, Fe), Distilled water, Boiling water.
What results should I expect from धातुओं की विशिष्ट ऊष्मा क्षमता?
Aluminum should give the largest temperature rise in the water (highest specific heat), followed by iron, then copper. Measured values should be within 10-20% of accepted values.