A solution has a specific gravity of 2.3 g/ml and an assay value of 10%. What is the amount of the substance per ml? 25.You have a solution with a concentration of 10 mg/ml and 100 ml of this solution is to be prepared, how many milligrams is needed? 26.You are trying to make 1 L of a solution with a concentration of 2.5 ml/ml. Show how you would do that. Remember 1L ＝ 1000ml 27.You have 30 grams of Nacl and you dilute to 500 ml. What is the concentration in per cent? 28.What is the molarity of a solution containing 50 g of NACL per liter? NACL has a molecular weight of 58.5 29. If the molecular weight of a substance is 85, what is the osmolarity? 30.A mixture requires 20 g of NaCl in 500 ml of solution. If 100 ml is needed, how much NaCl is required? 31.You need to prepare a solution of 500 ml of 2 g of NaCl. You only have a NaCl solution with a concentration of 20g. How do you prepare the solution? 32.You are doing 1:2 serial dilutions. In the fifth tube, you get a result of 50 for glucose. What is the final result? 33.You are doing 1:5 serial dilutions. In the third tube, you get a result of 50 for glucose. What is the final result? 34.In #32 above, in tube three, you get 70, what is the final result? Explain any difference in result. Which do you believe is the best result and why? 35.Explain how you would make the serial dilutions in #32 36.Explain how you would make the serial dilutions in #33 37.Explain the purpose of doing serial dilutions.
