 Finally, the residue is extracted with about five times its weight of boiling water, and the solution filtered. The filtrate is preserved as test solution, in widemouthed bottles, stoppered with loose plugs of cotton to exclude dust, but to admit air....  Essentials of volumetric analysis - الصفحة 339بواسطة Henry William Schimpf - 1917 - عدد الصفحات: 366عرض كامل - لمحة عن هذا الكتاب
 | Henry William Schimpf - 1894 - عدد الصفحات: 430
...present. The blue solution thus obtained, after being acidulated may be used to make red litmus-paper. Finally, the residue is extracted with about five...be prevented by saturating the solution with NaCl. The British Pharmacopoeia recommends to boil the litmus in powder with three successive portions of... | |
 | William Simon - 1895 - عدد الصفحات: 566
...extracted with about five times its weight of boiling water, and filtered. The solution should be kept in wide-mouthed bottles, stoppered with loose plugs of cotton to exclude dust but to admit air. Blue and red litmm paper is made by impregnating strips of unsized white paper with the blue solution... | |
 | Henry William Schimpf - 1898 - عدد الصفحات: 582
...present. The blue solution thus obtained, after being acidulated may be used to make red litmus-paper. Finally, the residue is extracted with about five...be prevented by saturating the solution with NaCl. The British Pharmacopoeia recommends to boil the litmus in powder with three successive portions of... | |
 | Samuel Philip Sadtler - 1898 - عدد الصفحات: 344
...with about 5 times its weight of boiling water, and filter. Preserve the filtrate, as test-solution, in wide-mouthed bottles stoppered with loose plugs of cotton to exclude dust but to admit air. Acids in general change the blue color of litmus to red ; alkalies restore the blue color. Carbon dioxide... | |
 | Samuel Philip Sadtler, Henry Trimble - 1898 - عدد الصفحات: 344
...with about 5 times its weight of boiling water, and filter. Preserve the filtrate, as test-solution, in wide-mouthed bottles stoppered with loose plugs of cotton to exclude dust but to admit air. Acids in general change the blue color of litmus to red ; alkalies restore the blue color. Carbon dioxide... | |
 | William Simon - 1898 - عدد الصفحات: 558
...extracted with about five times its weight of boiling water, and filtered. The solution should be kept in wide-mouthed bottles, stoppered with loose plugs of cotton to exclude dust but to admit uir. Blue and red litmus paper is made by impregnating strips of unsized white paper with the blue... | |
 | 1907 - عدد الصفحات: 844
...containing 5 drops of the indicator should produce a distinct change in color. Preserve the filtrate, as test solution, in wide-mouthed bottles stoppered with loose plugs of cotton so as to exclude dust but admit air. The blue color of litmus test solution is changed by acids to... | |
 | Edward William Lucas - 1908 - عدد الصفحات: 440
...containing live drops of the indicator should produce a distinct change in colour. Preserve the filtrate, as test solution, in wide-mouthed bottles stoppered with loose plugs of cotton so as to exclude dust but admit air. The blue colour of litmus test solution is changed by acids to... | |
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