VIII.| -- | 12.47 | -- | -- | | | | IX. }| 10.43 | 0.676 | 11.11 | 15.0 X. }| 3.828 | 0.184 | 4.0 | 21.0 -----+-----------+-----------+-----------------+----------- The Guldberg-Waage curve at 100° was also determined, and it was found that the ratio K_{2}CO_{3}: K_{2}SO_{4} is also not constant, although the variations are not so great as at 25°. GULDBERG-WAAGE CURVE AT 100°. ----------------------+-----------------------+-----------------+------- |100 moles of water | | K2CO3 Solid phases. |contain, in moles, | [Sigma]_k__{2} | ----- | | | | K2SO4 |K_{2}CO_{3}|K_{2}SO_{4}| | ----------------------+-----------+-----------+-----------------+------- BaCO_{3} + K_{2}SO_{4}| 23.9 | 12.65 | 35.65 | 1.82 + BaSO_{4} | | | | BaCO_{3} + BaSO_{4} | 6.28 | 2.02 | 8.3 | 3.1 " " | 3.17 | 0.851 | 4.025 | 3.7 ----------------------+-----------+-----------+-----------------+------- * * * * * {330} APPENDIX EXPERIMENTAL DETERMINATION OF THE TRANSITION POINT For the purpose of determining the transition temperature, a number of methods have been employed, and the most important of these will be briefly described here. In any given case it is sometimes possible to employ more than one method, but all are not equally suitable, and the values of the transition point obtained by the different methods are not always identical. Indeed, a difference of several degrees in the value found may quite well occur.[398] In each case, therefore, some care must be taken to select the method most suitable for the purpose.