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permanganate solution until a pink color is obtained which persists for 15-20 seconds. From the molarity of the permanganate solution and the fact that the antimony is oxidized from the trivalent to the pentavalent state, calculate the amount of Sb present in the sample; also calculate the corresponding amount of Sb204 and apply the necessary correction for Sb2O4 in the impure stannic oxide, § 410.

Note 1. Hot 18 molar sulphuric acid oxidizes metallic antimony to antimonous ion, provided the heating is not carried on after all the antimony is in solution; the tin is oxidized to stannic ion, while the lead separates out as lead sulphate.

Note 2. The potassium sulphate is added in order to raise the boiling point of the solution and thereby bring about a more rapid decomposition of the alloy.

Note 3. The addition of the tartaric and hydrochloric acids serves to keep the antimony in solution by forming the complex tartrate ion and by preventing the hydrolysis of the antimony salts.

Note 4. The solution is titrated at once, because upon standing some antimonous ion is oxidized by atmospheric oxygen.

Note 5. The solution must be cooled to room temperature before titrating because chloride ion is rapidly oxidized to chlorine by permanganate ion in hot solutions.

Note 6. The end point is not permanent but gradually fades due to the slow oxidation of chloride ion to chlorine by the slight excess of permanganate ion necessary to give the end point.

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Saturated Solutions of Some Reagents

Table of Percentages of Ionization of Acids

Table of Percentages of Ionization of Bases

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1 Compiled by the International Committee on Atomic Weights, consisting of F. W. Aston, Gregory P. Baxter, Bohuslav Brauner, A. Debierne, A. Leduc, T. W. Richards, Frederick Soddy and G. Urbain J. A. C. S. 47, 600 (1925).

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120

990 *027

121

08 279

422

122

123

124

09 342

918 954
314 350 386
458 493 529 565
636 672 707 743 778 814 849 884 920 955
991 *026 *061*096*132 *167 *202 *237 *272 *307
377 412 447 482 517
552 587 621

*063*099*135*171 *207 *243

600

38 37 36

656

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140

141

142

143

144

613 644 675 706 737 768 799 829 860 891 922 953 983 *014 *045 *076 *106 *137 *168 *198 15 229 259 290 320 351 381 412 442 473 503 534 564 594 625 655 685 715 746 776 806 836 866 897 927 957 987 *017 *047 *077 *107

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* This table has been verified by comparison with the values given in the following publication, A New Manual of Logarithms to Seven Places, edited by Dr. C. Bruhns, Bernhard Tauchnitz, Leipzig, 1913; Lemcke & Buechner, New York, 11th stereotype edition.

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160

412

439 466

161

162

163

164

484

511

493 520 548 575 602 629 656
683 710 737 763 790 817 844 871 898 925
952 978 *005 *032 *059*085*112 *139*165*192
21 219 245 272 299 325 352 378 405 431 458
537 564 590
643 669 696 722

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858 881 905
951 975 998 *021 *045 *068*091*114 *138 *161
27 184 207 231 254 277 300 323 346 370 393
416 439 462 485 508 531 554 577 600 623
646 669 692
715 738 761 784 807 830 852

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292 314 336
447 469 491 513 535 557
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137 159 181 203
358 380 403 425
579 601 623 645

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