The Cl− concentration of a solution was determined by coulom…

The Cl− concentration of a solution was determined by coulometric titration. Ag+ generated at the anode reacts with the Cl− in solution, forming the precipitate AgCl(s). The end point is determined when an increase in current is detected due to excess Ag+ in solution. A current of 0.500 A was applied for 17.55 min through a 25.00-mL solution containing an unknown Cl− concentration. Calculate the Cl− concentration. (Report to 4 decimal places)

A Na2CO3 (FM 105.99) standard solution is prepared by transf…

A Na2CO3 (FM 105.99) standard solution is prepared by transferring 2.481 7 g of primary standard-grade sodium carbonate to a 250.0-mL volumetric flask, dissolving the sample in ~100 mL of distilled deionized water, and diluting to the mark. A 25.00-mL aliquot is taken and titrated with 42.65 mL of an HCl solution. Calculate the concentration of the HCl solution. (Report to 4 decimal places)

Which of these practices help(s) protect the purity of chemi…

Which of these practices help(s) protect the purity of chemical reagents? Avoid putting a spatula into a bottle Never pour unused chemical back into the reagent bottle Never put a glass stopper from a liquid-reagent container on the lab bench Store chemicals in a cool, dark place