77. We have seen that salts are made by the union of acids and bases. Can these last be obtained from salts?
78. Preparation of HCl.
Experiment 47.-Into a flask put 10 g. coarse NaCl, and add 20 cc. H2SO4. Connect with Woulff bottles [Woulff bottles may be made by fitting to wide-mouthed bottles corks with three holes, through which pass two