answer all parts of this problem please

9. A set of lead standards are needed to analyze a soil sample for lead content. The standards are prepared in the following way: 25 mg of lead metal are dissolved and diluted to a total volume 250 mL (solution a). Then, four samples of solution a, with volumes of 1. 2. 3 and 4 mL are added to four 50 ml. volumetric flasks (respectively). These solutions are labeled B1, B2, B3 and B4. 9a. Sketch a picture of this procedure. Label each solution with its volume and name, and show with arrows the quantity of solution transferred in each case. 9b. Calculate the lead concentration in solution a in mg/L. 9c. Calculate the lead concentration in solution Bl in mg/L. 9d. Calculate the lead concentration in solutions B2, B3, and B4 in mg/L