Question

Part I: You are instructed to produce solutions of H2S04 and NaOH for your lab experiment. The concentration you should produce is shown in the table below. Complete the table and copy it into your lab notebook for use during your lab. You will be provided with a 3.0 M stock solution of H2SO4 and solid NaOH. You will need to make 100 mL of each solution. H2SO4 Compound NaOH 0.9 Solution Concentration (M) 1.12 Moles in 100 mL 112 090 Volume H2504 Stock Needed in mL Grams NaOH Needed Part 2: You are presented with a mystery as part of your practical experiment. You have a solution of Pb(NO3)2 that has a worn label making it impossible to read. You know the concentration is below 1.0 M as you can make out "O.xxx" at the beginning of the label. In order to determine the concentration, you decide to precipitate out the lead in the solution as PbSO4. If you added 1.0 mL of the unknown Pb(NO3)2 to a test tube, what is the amount of H2S04 in mL you will need to add to be sure the H2504 is the excess reagent? NOTE: H2504 is expensive so you should not use more than absolutely necessar)y mL H2504 Needed- Part 3: After the reaction is complete, you centrifuge the sample, dry and weigh it. The ppt is found to weigh 0.346 grams. Based on this mass, what was the original concentration of the unknown Pb(NO3)2 solution? [Pb(NO3)2l

Answer 1

m,y: My各 ㅡ 1-1 2.mx 37-333m。 v, Nolume 0 Shck needed i n 37.3 m = 0,09 o mol Χ 39,997 a/ml Needed 岔 Vo 0.89196 m Hso,needed O892 303-262/mo o o0I4 1000. 0011409.01000ㅡ딥14m [rung