Page:Proceedings of the Royal Society of London Vol 69.djvu/122

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Percentage concentration.

Temperature coefficients

I

Percentage Temperature i concentra- coefficient i tion. 10~ 6.

Percentage concentra- tion.

Tempera- ture coeffi- cients

io- r v

2-19

95

41 -45 293

75-23

447

3-85

94

44 -69 326

78 -07

447

6-76

108

46 -90 340

81-12

484

9-29

122

49-12 352

84-11

441

11-88

128

51 -00 372

85-86

442

16-11

156

54 -63 386

87-26

455

18-27

177 57 -00

388

89-88

441

21-66

190 60-33

40(3

91-24

465

25-07

217 63 -07

420

92-82

488

29 -40

231 66 -GO

419

95-66

483

32 -50

267 67 -92

432

98-67

484

34-26

280 70 -04

418

99-87

490

36-68

279 71 -51

432

39-11

292

74-03

433

It will be observed that these temperature coefficients increase gradually but by no means uniformly with increase of percentage ; in both cases only very small differences are measured, which accounts for the slight irregularities. There is probably some function con- necting these two factors, but from certain trials made it does not appear to be of a simple character.

The value for the 60-33 per cent, acid, namely, 0-000406 is not widely different from that 0-000424 given by van der Willigen for his sample of 58*89 per cent, concentration.

mil. Results.

The results for /X D reduced to a uniform temperature are set forth in the following table :

II

1

Percentage

Percentage

Percentage

concen-

14'2

^n

conceit -

jUj, 14 '-. concen-

V 4 ' 2 -

tration.

t ration.

tration.

2-19

1 -336208

41 -45

1 -38S788 75 -23

1 -405599

3-85

338434

44 -69

392305 78 -07

405091

6-76

342298

46-90

394496 81 '12

404504

9-29

345824

49-12

396699 84-11

403427

11-88

349371

51-0

398435 85 '80

402924

16-11

355107

54-63

401017 87 -20

402412

18-27

358541

57-0

402440 89 '88

401419

21-66

363091

60-33

404080 91 -29

401017

25-07

365152

63-07

405157 92 -82

400249

29-40

374225

66-60

4058(30 95 '66

398148

32-60

377798

67-92

405985 98 '67

396980

34-26

380354

70-04

406094 99 -87

397167 (

36-68

383039

71-57

406046

39-11

386262

74-63

405696