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Flux solder detecting means read for 191 times First. Determination of the halogenic content
Experimental method: Potentiometric titration 1. Reagent: 1Ethanol- Benzene mix solutions 10:1 2Silver nitrate standard solution 0.05N need standardization 2.Instrument: The entiometer, silver electrode, calomel electrode glass electrode 3.Basic principle: omitted Note: Until can the intersection of Sri Lankan and special formula it derives potentiometric titration to be whether a measurement titrate method that electric potential change in the reaction process, when titrating and reflecting that reaches the equivalent point, the sudden change of material density to be measured, make the electric potential of indicating electrode produce and jump suddenly, so can confirm for terminal. 4.The formulating of silver nitrate standard solution: Weigh 8.494g silver nitrate by 1/10000 of the balances, and then dissolve in 0.05N 1L measuring flask . 5.The formulating of sodium chloride standard solution of basic reference: Weigh sodium chloride top grade purely by reducing the magnitude method In the crucible, toast for about 2 hours at 550 ℃, drop to the room temperature, transfer to the weighing bottle and weigh, fetch the intersection of 50ml and little flask, sodium chloride slowly divide for several times Pour in the small beaker, call heavy 1.64g, dissolve, shift in 1L measuring flask. 1ml=0.001g chlorine 6.Potassium chromate 2% Solution is formulated: Claim to fetch 2g potassium chromate to mix into 2% aqueous solution. 7.The silver nitrate of standardization: Draw 10ml solution in 250ml conical flask, regards silver solution chromic acid as indicator, it is the terminal to titrate to be faint yellow with silver nitrate solution. The coefficient C calculated by following formula: C =0.01/V g/ml . 8.Experimental procedure: Weigh samples about 1g accurately If move the test solution 1ml which fetches known proportion for flux, formulate into 200ml solution in 500ml beaker, connect the good electrode, start electromagnetic stirring, titrate with 0.05N silver nitrate solution, record the solution volume of spent silver nitrate ml And corresponding electrode potential mv . All experiments need to carry on the blank test.
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