Question

How should you prepare 250 mL of 0.25 M KCl (aq)? Select one: a. Weigh out 10.00 g of KCl into a flask and add 500 mL of water b. Weigh out 9.32 g of KCl into a flask and add water until the 250 mL line is c. Weigh out 62.5 g of KCl into a flask and add water until the 250 mL line is d. Weigh out 2.50 g of KCl into a flask and add 250 mL of water © e. Weigh out 4.66 g of KCl into a flask and add water until the 250 mL line is ers Jump to... Lab X Buffers Return to: S20 CLAB 124-00..

Answer 1

How should you prepare 250. mL of 0.25 M KCl (aq)? Select one: a. Weigh out 10.00 g of KCl into a flask and add 500 mL of water b. Weigh out 9.32 g of KCl into a flask and add water until the 250 mL line is c. Weigh out 62.5 g of KCl into a flask and add water until the 250 mL line is @ d. Weigh out 2.50 g of KCl into a flask and add 250 mL of water b e. Weigh out 4.66 g of KCl into a flask and add water until the 250 ml line is moles of KCI - (10 g)/(74.55 g/mol) - 0.134 M Molarity (M) - (0.134 M)/(0.5 L) - 0.27 M moles of KCI - (9.32 g)/(74.55 g/mol) - 0.125 M Molarity (M) - (0.125 M)/(0.25 L) - 0.5 M moles of KCI - (62.5 g) / (74.55 g/mol) - 0.838 M Molarity (M) - (0.838 M) / (0.25 L) - 3.35 M moles of KCI - (2.5 g)/(74.55 g/mol) - 0.033 M Molarity (M) = (0.033 M)/(0.25 L) = 0.134 M moles of KCI - (4.66 g)/(74.55 g/mol) - 0.0625 M Molarity (M) = (0.0625 M)/(0.25 L) = 0.25 M