By William Ramsay
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Additional info for Modern chemistry : theoretical
1 60 cms. 5 grams of ammonium chloride were placed in : a vacuous vessel of 22,380 cc. , and if no dissociation were to take place, one would expect a pressure equal to that of It has been found, however, that 1 60 cms. of mercury. the actual pressure is twice that amount, or 320 cms. In order to account for the doubled pressure, the supposition that dissociation has taken place must again be made ; that is, in order that the pressure must be doubled, twice as many molecules must be present as one would have supposed from The fact of dissociation may accordingly the weight taken.
Now let half a litre As of hydrogen be introduced by means of a force-pump. temperature and volume remain the same, the pressure will be increased to 76 cms. + 38 cms. Introduce another halflitre of hydrogen, and the initial pressure will be doubled; it Let another litre of hydrogen be will now be 152 cms. introduced, and the initial pressure will be trebled. might introduce a third gas, say nitrogen, into the vessel, and We the pressure would be increased proportionately to the quan- LAW OF PARTIAL PRESSURES 23 Each constituent of the gaseous mixture, accordingly, exerts pressure on the walls of the containing tity introduced.
Ions, other molecules to MODERN CHEMISTRY 48 The element carbon is most frequently used to displace In its case, little or nothing is known of the electrical actions ; but if analogy may be taken as a guide, its action may be attributed to a similar exchange of electric charge between the displaced element and the But here the carbon, as soon as it unites with the carbon. oxygen which was previously in combination with the displaced element, escapes in the form of gas, and the oxide of carbon is certainly not an ionised compound.