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2) Standard mercuric nitrate titrant, 0.007 05M (0.0141N): Dissolve 2.3 g Hg(NO3)2 or 2.5g Hg(NO3)2⋅H2O in 100 mL distilled water containing 0.25 mL conc HNO3. Dilute to just under 1L. Make a preliminary standardization by following the procedure described in ¶ 4a. Use replicates containing 5.00 mL standard NaCl solution and 10 mg sodium bicarbonate (NaHCO3) diluted to 100 mL with distilled water. Adjust titrant to 0.0141N and make a final standardization; 1.00 mL = 500 ¦Ìg Cl¨C. Store away from light in a dark bottle.

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