A college text-book of chemistry . ut 40 to 50 cc.; and the measuring tube C should have acapacity of about 100 cc, and be graduated to ^ cc. The experiment is conducted in the following manner : D isfilled with distilled water ; a piece of zinc weighing from gram is placed in the flask ; the pinch-cock E is then opened,and the whole apparatus thus filled with water. The apparatusis now examined in order to ascertain if gas-bubbles are lodgedunder the stopper F or in the glass-wool. If so, they can usuallybe dislodged without difficulty. If they persist, a few momentsboiling of t
A college text-book of chemistry . ut 40 to 50 cc.; and the measuring tube C should have acapacity of about 100 cc, and be graduated to ^ cc. The experiment is conducted in the following manner : D isfilled with distilled water ; a piece of zinc weighing from gram is placed in the flask ; the pinch-cock E is then opened,and the whole apparatus thus filled with water. The apparatusis now examined in order to ascertain if gas-bubbles are lodgedunder the stopper F or in the glass-wool. If so, they can usuallybe dislodged without difficulty. If they persist, a few momentsboiling of the water in the flask will effect their complete re-moval. . The eudiometer is now placed over the outlet of thedelivery-tube, and the greater portion of the waterremaining inD allowed to flow through the apparatus. Sulphuric acid of theconcentration ordinarily employed in the laboratory (1 of HjSC^to 4 of H,0) is poured into the reservoir D until it is nearly pinch-cock E is then opened, and the water which fills the. Fio. 16. apparatus is displaced by sulphuric acid. The action of the acidupon the metal may be facilitated by heat or by adding someplatinum scraps*: When the action is over, the contents of theflask are swept through the delivery-tube by again opening thepinch-cock E. Finally, the measuring-tube is transferred to acylinder of water, and the volume of the gas read and correctedin the usual manner. If hydrochloric instead of sulphuric acidhas been used, which would be the case when the metal employedis aluminium, a little caustic soda should be added to the waterin the cylinder to which the eudiometer is transferred. EXPERIMENTS WITH HYDROGEN. 67 A litre of hydrogen at 0° and 760 mm. weighs much does the hydrogen obtained in the experiment weigh ?How much ought to have been obtained ? How many cubic cen-timetres of hydrogen ought to have been obtained ? Try the same experiment, using tin and hydrochloric acid. Theaction takes place as rep
Size: 1836px × 1361px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectchemistry, bookyear19
