H2O2 Refractive Index

Note: Care must be taken to ensure that the sample holder or prism is non-catalytic to H2O2 lest the oxygen bubbles formed through decomposition interfere with the measurements.

The refractive index for H2O2 is greater than that of water, and the curve relating to composition is slightly concave upward.

Experimental values for refractive index:

H2O2 Conc.wt.%	η_D
H2O2 Conc.wt.%	25 °C	20 °C
0.0₀	1.3325₁	1.3329₉
10.1₀	1.3388₁	1.3394₆
19.9₈	1.3452₁	1.3460₃
30.1₁	1.3520₃	1.3529₆
40.0₃	1.3588₅	1.3598₆
50.1₀	1.3661₁	1.3672₄
60.6₆	1.3738₉	1.3750₈
70.1₅	1.3815₁	1.3828₄
79.8₆	1.3892₇	1.3907₂
92.3₆	1.3999₈	1.4015₇
96.2₆	1.4033₃	1.4049₅
99.3₀	1.4060₇	1.4077₄

Ref: P.A. Giguere and P.Geoffrion, Can. J. Res., 27B:168 (1949)

The temperature coefficient for the refractive index is also greater for H2O2 than it is for water: 10⁵ α_n = 7.7 + 16.5 ω?

Temperature corrections to be subtracted from the percentage of H2O2 determined above:

Temp. °C	Approximate Concentration, wt.%
Temp. °C	10	20	30	40	50	60	70	80	90	100
20	0.9	1.2	1.3	1.4	1.4	1.5	1.6	1.7	1.8	1.9
21	0.8	1.9	1	1.1	1.1	1.2	1.2	1.3	1.4	1.5
22	0.6	0.7	0.8	0.9	0.9	1	1	1	1.1	1.1
23	0.4	0.4	0.5	0.6	0.6	0.6	0.6	0.7	0.7	0.8
24	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.4	0.4	0.4

Ref: P.A. Giguere and P.Geoffrion, Can. J. Res., 27B:168 (1949)

Constants derived from refractive data:

			H₂O₂	H₂O
Specific Refraction	r_D	cc/g, 25 °C	0.1705	0.206
Molar Refraction	[R]_D	cc/mole, 25 °C	5.801	3.712
Polarizability	α x 10²⁴	cc/molecule, 25 °C	2.3	1.47
Molar Dispersion	[R]_G - [R]_c	cc/mole, 20 °C	1.3576	0.929
Dispersion Constant	α x 10-30	sec^-2, 20 °C	8.479	6.532
Characteristic Frequency	ν ₀ x 10-15	sec^-1, 20 °C	2.979	2.94

Ref: P.A. Giguere, Can. J. Res. 21B:156 (1943)
P.A. Giguere and P.Geoffrion, Can. J. Res., 27B:168 (1949)

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