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½û³æ (Ö°Òµ×÷¼Ò)
- ·ÒëEPI: 466
- Ó¦Öú: 1 (Ó×¶ùÔ°)
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- ½ð±Ò: 8727.8
- É¢½ð: 850
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- ×¢²á: 2010-06-14
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Evan2008(½ð±Ò+10, ·ÒëEPI+1):·Ç³£¸Ðл 2010-07-07 11:03:16
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Take 2g (precise to 0.0001g) of the sample which was dried at 110¡æ¡À2¡æ until constant weight. Then dissolve the sample into 100ml anhydrous carbon dioxide. Finally conduct titration with standard chloride acid solution (c=0.5mol/L) until the pH value equals 4.2. The mass of disodium hydrogen phosphate, in percentage, can be calculated by Equation (1). Xxxx in which, V is the volume of chloride acid, mL C is the concentration of chloride acid, mol/L M is the molar mass of disodium hydrogen phosphate, g/mol M is the mass of the sample, g |
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