Basic method. Depending on likely free acid strength, pipette between 1 10mL of test solution into a titration beaker. Add 15mL saturated potassium oxalate solution, and dilute to approximately 25mL with D.I. water. Titrate to the first exothermic endpoint with standard 1 mol/L NaOH 瑞士萬通859 溫度滴定儀