c 48 3 



to the fixed air of the mineral alkali. The mi- 

 neral alkali gives out fixed air enough to redif- 

 folve it in the water ; but expofing it to a little 

 heat detaches this fixed air, and the magnefia will 

 be precipitated. This magnefia may be further 

 diffolved again with effervefence, by adding any 

 acid. 



f. Upon adding a fmall qumtity of fal. am- 

 moniac, the mineral alkali will combine with 

 the marine acid of the fal ammoniac, and de- 

 tach the volatile alkali, which will fly off, and 

 may be rendered vifible by holding a paper 

 moiftened with fome volatile acid over it, as the 

 nitrous, marine, or acetous. Thefe forming ni- 

 trous, marine, or acetous ammoniac, which be- 

 comes more vifible. 



g. By adding a fmall quantity of a folution 

 of blue vitriol in water, a precipitate of a bright 

 apple green colour will be occafioned by the al- 

 kali combining with the vitriolic acid of the blue 

 vitriol, forming Glauber fait, which is foluble 

 in the water, while the fixed air combines with 

 the copper, which being infoluble, is precipi- 

 tated. 



3. GLAUBER SALTS. 

 Natron combined with Vitriolic Acid. 



Synonymous Names, 

 f Sal. mirabile. 



I catharticus, 



3. GLAUBER SALTS. { Soda vitriolata. 



j Natron vitriolatum. 

 L Sulphate of foda. 



Its cryflals are prifms with fixth unequal and 

 ftriated fides, terminating in dihaedrel fummits: it 

 has a bitter tafte. When expofed to the air, the 

 * cryftals 



