6.1.4 Variable-Speed Mechanical Stirrer, a suitable type, equipped with a propeller-type stirring paddle. The rate of
stirring shall be sufficient to produce vigorous agitation without spattering and without stirring air into the solution.
A propeller with blades 6 mm in radius and set at a pitch of 30 to 45° is satisfactory.
A magnetic stirrer is also satisfactory.
6.1.4.1 If an electrical stirring apparatus is used, it shall be electrically correct and grounded so that connecting or disconnecting the power to the motor will not produce a permanent change in the meter reading during the course of the titration.
6.1.5 Burette, 10-mL capacity, graduated in 0.05-mL divisions and calibrated with an accuracy of 6 0.02 mL.
The burette shall have a tip that extends 100 to 130 mm beyond the stopcock and shall be able to deliver titrant directly into the titration vessel without exposure to the surrounding air or vapors.
The burette for KOH shall have a guard tube containing soda lime or other CO2-absorbing substance.
6.1.6 Titration Beaker, 250 mL capacity, made of borosilicate glass or other suitable material.
6.1.7 Titration Stand, suitable for supporting the electrodes, stirrer, and burette.
6.1.4 Variable-Speed Mechanical Stirrer, a suitable type, equipped with a propeller-type stirring paddle. The rate ofstirring shall be sufficient to produce vigorous agitation without spattering and without stirring air into the solution. A propeller with blades 6 mm in radius and set at a pitch of 30 to 45° is satisfactory. A magnetic stirrer is also satisfactory.6.1.4.1 If an electrical stirring apparatus is used, it shall be electrically correct and grounded so that connecting or disconnecting the power to the motor will not produce a permanent change in the meter reading during the course of the titration.6.1.5 Burette, 10-mL capacity, graduated in 0.05-mL divisions and calibrated with an accuracy of 6 0.02 mL. The burette shall have a tip that extends 100 to 130 mm beyond the stopcock and shall be able to deliver titrant directly into the titration vessel without exposure to the surrounding air or vapors. The burette for KOH shall have a guard tube containing soda lime or other CO2-absorbing substance.6.1.6 Titration Beaker, 250 mL capacity, made of borosilicate glass or other suitable material.6.1.7 Titration Stand, suitable for supporting the electrodes, stirrer, and burette.
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