Experiment No . 1 ( B.Sc. 5th Semester Physics Project file )

                             Experiment No. 1 bsc.5th semester

(To determine the specific rotation of sugar water solution with the help of Polarimeter.)

Object 

            To determine the specific rotation of sugar water solution with the help of Polarimeter.

Material required

            Laurent’s half shade polarimeter, prepared solution of cane sugar dissolved in water , sodium lamp , balance weight box , beaker , graduated cylinder tunnel , pipette , glass road , filter paper .

Formula

            Least count = Value of smallest division in main scale / total division in verniar scale

LC = 1 ͦ= 1 ͦ/10 = 0.1 ͦ x 60 minute = 6 minute

Least count = 6 minute

1.      Mass of sugar cube = 8gm

2.      Volume of the solution = 100 ml

3.      Concentration of solution M/V = 0.08 gm/cc

4.      Length of polarimeter tube = 2 Decimeter

5.      Room temperature = 27  ͦ C

Observation table

Table for specific rotation

Value of one division of main scale = 1 ͦ

Number of division on Vernier scale = 6 minute or , 0.1 Degree

Annalyser reading with pure water			Annalyser reading with pure solution			(a - b) in Degree	θ  ͦ (b)	Concentration of scale
Maine scale	Vernier scale	Total (a)	Maine scale	Vernier scale	Total (b)		.i + ii / 2	g/cc
305	05	305.5	315	04	315.4	9.9 (i)	10.5	M/V
124	06	124.6	135	07	135.7	11.1(ii)		0.08

 

Total reading = main scale reading + vernier scale reading x least, count

Specific rotation = θ x volume of solution /Sugar mass x length of polarimeter

                                    = 10.5x100/8x8

                                    = 65.625

                                    = 65.62 Degree/dm/gm/cc

Result

            The specific rotation of cane , sugar solution at temperature t ( 25  ͦ c ) for sodium light (wavelength λ = 5893 Aͦ) is found to be 65.62 degree / dm / cc .

Sources of error and precautions

1.      The position for equal, darkness of the field should be carefully adjusted .

2.      Solutions of uniform concentration should be obtained by through mixing  .

        Note.

(Please note: if a particular experiment is not visible, please search for it using the search box—for example, Experiment No. 2 To determine the wave length  of Laser beam using plane diffraction grating.

कृपया ध्यान दीजिये अगला  एक्सपेरिमेंट न दिख रहा हो वो आप सर्च बॉक्स में सर्च कर लीजिये . जैसे , एक्साप्रिमेंट नंबर. 2 या फिर To determine the wave length  of Laser beam using plane diffraction grating.