Test Method: Use 85g / L sodium nitrate solution will be configured as a dilute solution sample, with Ubbelohde viscometer to determine the ultimate viscosity, according to empirical formula to calculate the molecular weight of the sample.
Reagent solution: 85g / L sodium nitrate solution
Equipment: Ubbelohde viscometer (capillary diameter 0.55mm)
Constant temperature water bath (can control 30 ℃ ± 0.1 ℃)
Stopwatch (division 0.1s)
Acid filtration funnel
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Experimental steps:
1. Determination of sodium nitrate solution outflow time
The clean, dry Ubbelohde viscometer vertically placed 30 ℃ ± 0.1 ℃ constant temperature water bath so that the U-viscometer D ball all submerged under the water.
Will be filtered through acid filtration funnel sodium nitrate solution was added to the Ubbelohde viscometer filling line between G, so far, constant temperature 10min-15min.
M tube set a hose, with the clip, use the ear ball to the sodium nitrate solution into the D ball half, remove the ear wash ball, open the M tube.
Measure the time it takes for the sodium nitrate solution to flow through the timed markers E, F with a stop watch. Repeated determination of three times, the error does not exceed 0.2s, whichever is the average t0.
2. Preparation of sample solution
Weigh 0.03 g of solid sample or equivalent amount of colloidal sample from a known 50 mL dry beaker to the nearest 0.2 mg and dissolve with sodium nitrate solution. All transferred to 100mL volumetric flask, diluted with sodium nitrate solution to the mark, shake.
3. Determine the outflow time of the sample solution
The outflow time t1 of the sample solution is determined by the first step method
4. Calculate the result according to the formula
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