The recommended procedure for preparing a very dilute solution is not to weigh out a very small mass or measure a very small volume of stock solution. Instead, it is done by a series of dilutions.   A sample of 0.7479 g of KMnO4 was dissolved in water and made up to the volume in a 500.0−mL volumetric flask. A 2.000−mL sample of this solution was transferred to a 1000−mL volumetric flask and diluted to the mark with water. Next, 10.00 mL of the diluted solution was transferred to a 250.0−mL flask and diluted to the mark with water.

1500 1400 1300 1200 1100 Cu 2 PROBLEM 3 50 1270 °C (i) Define liquidus and solidus temperatures. (ii) Determine the mass fraction of each phase in the Cu-40% Ni alloy at 1270 °C. 20 40 Caffs and notifications will vibrate Weight percent nickel The equilibrium phase diagram for the Cu-Ni system is shown in Figure. . 58

10. A container is separated into two halves by a membrane. Your lab partner assistant, Thurmond, is supposed to place a MgCl2 solution on side 1 and a NaCl solution on side 2. He is then supposed to measure the rate of water movement across the membrane. Unfortunately, Thurmond is not very good about keeping complete lab notes and he has forgotten to write down some data and calculations. Using your knowledge of osmosis, complete the following table. Temperature is 15°C and the hydraulic conductivity for the membrane is 0.4 ml/atm sec. MgCl2 Concentration on Side 1 NaCl Concentration on Side 2 80 mM Osmolarity on Side 1 Osmolarity on Side 2 Difference in osmotic pressure 60 mosM across the membrane Jy 0.95 ml/sec Reflection coefficient (ơ) Direction of water movement

85.3 g of oxalic acid dihydrate, H,C,O4 · 2H,O (MM 126.07 g/mol), is used to prepare 450.0 mL of solution 1? What is the molarity of a new solution made by diluting 30.0 mL of the solution 1 to 250 mL? O 1.13 M O 0.180 M O 0.162 M O 2.27 M O 0.081 M