- / - .

NATIONAL BUREAU OF STANDARDS REPORT

9876

'' 1 ~A&EJ~T~s~&MBER)~ (THRU)

(CODE)

/ + ' c ICLATEGORY)

ELECTROCHEMICAL DATA

BART X

ELECTROLYTIC CONDUCTIVITY OF AQUEOUS SOLUTIONS

OF THE ALKALI METAi HYDROXIDES

Prepared for

Nat iona l Aeronautics and Space Administra!ion

NASA Contract Number: R-09-022-029

. . NATIONAL BUREAU OF STANDARDS

https://ntrs.nasa.gov/search.jsp?R=19690001083 2019-04-28T06:20:16+00:00Z

NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT

2 1 iO4??

NBS REPORT 9876

ELECTROCHEMICAL DATA

PART X

ELECTROLYTIC CONDUCTIVITY O F AQUEOUS SOLUTIONS

OF THE ALKALI METAL HYDROXIDES

1; l/ Ha:o!d J . D e W a r i e

and Wa l te r J. Harne!

P r e j a r e c f o , N a t i o n a l A e r o n a u t i c s and Spa!.(: A d m ~ n i s t r a t r o n

N A S A Cont rac t N urn Ler. R-09-022429

IMPORTANT N O W

V A T ! 0 N A L BUREAU 0 F STANDARDS REPORTS are dua l ly ,m minary or progress accountmg df.dments Intended for use w ~ t h ~ n the Government Before mater~al ~n the rep; r i , IS forrn Ily yubl~shed ~t IS subjected tr d ~ t ~ o n a l evaluation and revlew. For t h ~ s reason, the publ~cat~on, repr~ntmg, resrc tuct~on, or onen-l~terature llsting ~f t, . Report, either i n whole or ~n part, IS not author~zed unless permiss~on IS obt m e 2 ir wrltlng from the Off~ce o! the D~rector. Nat~onal Bureau of Standards. Washwgton, D.C. 20234. Such permlsslor ,s not reeded, however. by the Government agency for which the Report has Been spec~t~cally prepared ~f tnat cgency w~shes to reprwluce addit~onal coples for tts own use.

US. DEPARTMENT OF COMMERCE NATIONAL BUREAU !'SF STANDARDS

Electrochemical Data X . Eler~rclyti:: Conductivity of Aqueous Solutions

of the Alkali Metal Hydroxides

-4B STRACT - ----

, This report gives a critical evaluation 02 the available data on the

e1ecerr;lytic conductivity of aquesua soir-rims of the alkali metal hydroxides.

Resvlte are given for sodium hydroxide at 15, 20, 25, 30, 40, 50, 60, 75, 80

atd 100 "c; for potassium hydroxide at 25, 30, 60, and 100 "c, and for

lithium hydroxide at 25 "c.

This report gives a critical evaluation of available data on the elec-

trolytic conductivity of aqueous solations of the alkali metal hydroxides.

Data were found on the conductivity of aqueous NaOH solutions at 15, 20, 25,

30, 40, 50, 60, 75, 80 and 100 " C [1,2,3,4,5]. One seemingly good source

[6! of NaOH data was not available for study. It was found that the

conductivity of aqueous K.OH solutions had been measured at 25, 30, 60 and

100 "C [2,4,7]; and LiOH at 25 "C [23. No modern data on the conductivity

cf aqueous RbOH and CsOH were found. The lateat reference to mearurcr-

ments on these solutions is cited in the International Critical Tables VI.

The rounded values of electrolytic conductivity given in the table8

are consistent with the Jones-Bradrhav r 9 ] conductivity standard, 12C m a l a

of atomic weights, and the absolute electrical units [lo].

The dats of Harsh and S;okus [I: an YzOU sofutiona i n the concmtr&tim

range C.000826 - 0.3097339N a t 15, 23, 50 m d 75 'C were used t o obtain A '

values dccordtng t o the Fuoes-R..ccaeclna [ ~ l ] procedure, and extrapolated to

obtain A, V R ~ U P S a t these tmperstwes w:.:h the rerultr rhown below:

A l e a s t squarer f i t of A, verrus t "C gave the following equation which

was used to calculate A= valuee a t other temperatures a s shown in the following

tabla.

The Fuora-Accascina methot! ,gas ::zed on the da ta of Darken and Meir r31

fo r LCOH, NaOH, and KVd so lu t i ans t o obtain the following h, valuer a t 25 O C .

.A J ( a ) c - 8

LiGH 237.3 173 0.11

NaOH 248.9 332 0.07

KOR 271. c 507 0.01

In the foregoing, and i n the t ab l r z , 1 reprerent r the standard devia t ion of

the f i t .

1 Results

The r e s u l t r of the study of the da ta on the e l e c t r o l y t i c conduct ivi ty

of NaOH ro lu t ionr a r e given i n Tables 1-10, on KOH solut ion8 i n Table8 11-13,

and on LiOH i n Table 14. I n much of the o r ig ina l da t a t he conduct ivi ty war

exprerred only am spec i f i c conductance, and t o t h ree d i g i t s . Ia t he re ca re r

we calculated the equivalent conductance t o three d i g i t s , which cxplainr

why many of the rounded valuer i n t he t ab l e s a r e expressed only t o t h i r

degree of exactnerr.

IV. Conclusions

Our study rhows t h a t with the po r s ib l e exception of aqueous solut ion8

of sodium and potarrium hydroxide, research on the e l e c t r o l y t i c conduct ivi ty

of the a l k a l i metal hydroxide6 has been badly neglected It i r hoped t h a t

t h i s r i t u a t i o n w i l l be remedied a t an e a r l y date .

K. N. Marsh and R . Ha Sr.,kac;, J -uc r~a l i an J. of Chcm., lJ, 740 (1964).

I. Y. Maksimov~ snd V. F. Yushkavich, Ruas. J. of Phys. Chem., 37, 475

(1963). (Temperature rsnge 20- 3OC "c) . L. S . Carken and B. P t?rt?r, f , r . . I , Cherr., Soc., 64, 621 (1942).

S. M. Mehta, M. B. Kahadi snd V. T. Sheth, Current Science (Bangalore),

15, 129 (1946). - M. A. Klochko and M. #. Godneva, Rusa. J. of Inorg. Chem., 4, 964

(1959). (Data a l r o a t 125, 150, 175 and 200 "c) .

G. L. Kobur, ' lElectr ical conductivity, v i scos i ty , and den r i ty of h ighly

concentrated so lu t ions of sodium hydroxide," Trudy Odeark. Gidrmeteorol .

I n r t . , 7, 113 (1955).

Chan. Abstract 52: 17908b taken from Zhur., Khim. 1956, Abstr. No. 31949.

Measurements of aqueour NaOH so lu t ions (1.005-28.731) between 25 and 83 O C

i n 5 " i n t e r v a l s were made.

(NBS and Library of Congrers do not have volume 7 of t h i s publ icat ion) .

V. Yu. Yushkevich, I. 17. Maksimova and V. G. Bullan, Soviet Electro-

chemistry, 3, 1342 (1967). (Data a l so a t 140, 180, 200, 220 and 260 "C).

M. Randall and C. C. 5-alione, J. Am. Chem. Soc., 49, 1486 (1927).

(Mearuremc~ >*: 9 made i n 1918).

C. Jones and B. C. Bradahaw, J. Am. Chcm. Soc., 55, 1780 (1933).

Natl. Bur. Standards Circular 459 (1947).

R. M. Fuors and F. Accarcina, E lec t ro ly t i c Conductance, p. 197,'-

In te r rc ience Publirhera, Inc. , New York, 1959.

Table 1 - Equivalent conductance of NaOH - H20 at 15 O C [I] -

A = 205.60-93.66~''~ + 90.06~ k g c + 105.26~ + 5066.2~~'~-48,966c~ + 137,922~~'~ r = 0.06

Table 2 - Equivalent conductance of NaOH - 8-0 at 20 'C [2? -

. 2.26-7. ON: A - 227.20-l05.52~~'~ + 84.082~-62. 734c3l2 + 18.448c2-1. 7948~~'~ r = .00001

- 6 -

Table 3 - Equivalent conductance of NaOH-H,O a t 25 'C [1,3,31

Table 4 - Equivalent conductance of NaOR-8,O at 30 'C [4]

Table 5 - Lqulvaleat conduct~ncu of Na011-R20 a t 40 'C [2]

- 9 -

Table 6 - Bquivale~tt conductance of 11.OR-820 at SO O C [I]

- lo -

;'itble 7 - Equivalent conductance of NaOH-H,O at 60 'C [21

- 11 -

Table 8 - Equivalent cimductarce of NaOH-H20 a t 75 O C [1,5,5,5,5]

Table 9 - Equivalent conductivity of '*aQI-I$O a t 80 'C r21

- 13 -

Table 10 - Equivdent conductivity o f NaOR-F$0 at 100 'C r 2 and 51

- 14 -

Table 11 - Equivalent conductance of KCM-B20 at 25 'C [3 ,3 ,3 ,3 and 71

Table 12 - Equivalent cmduct~nce of UB-820 at 30 'C [4]

Table 13 - Equivalent cor.ductancc of KOH-H20 a t 60 and 100 'C [7]

Table 14 - Equivalent conductance of LlOH-H20 at 25 O C

A

207.6

206.0

204 ,6

194.2

187.1

181.6

176.8

172.5

168.6

165.0

161.7

158.8

133.7

113.0

94.87

79.79

c

0.001

.002

.003

.004

.005

.006

.007

.008

.a09

.O1

.02

.03

.04

.05

.06

.07

A

233.6

232.0

230.8

229.7

228.9

228.1

227.3

226.7

226.1

225.5

221.0

217.7

215.1

212.9

211.0

209.2

c

0.08

.09

. 1

. 2

. 3

. 4

.5

. 6

. 7

.8

. 9

1 . 0

2.0

3.0

4 .0

5 . 0

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