Determine the total acidity of acetic acid (HC H,O, formula mass = 60.0 g/mol) in vinegar sample using a phenolphthalein indicator if 1g of vinegar requires 7.50 mL of 0.1005 M NaOH solution

4. A 3.0 g of coal sample was Kjeldahl and NH3 gas was absorbed in 45 mL of 0.1 N H2SO4. After the absorption, the excess (residual) acid required 8.5 mL of 0.1 N NaOH for exact neutralization. Determine the percentage of nitrogen in the coal sample. [% nitrogen = 1.7033%]

An inlet water solution of 800kg/h containing 12.0 wt % acetone is extracted with the solvent trichloroethane containing 0.5 wt % acetone in a countercurrent tray tower at 250C. The trichloroethane is essentially immiscible with water up to a concentration of acetone in water of 27 wt %. The exit concentration in the water stream is set at 1.0 wt % acetone. The equilibrium data is tabulated in Table 1. Table 1: The equilibrium data 0.0196 0.0467 0.0741 0.0909 0.0120 0.0294 0.0462 0.0571 0.0833 0.1081 0.1316 0.1304 0.1666 0.2000 a) Determine the minimum solvent rate needed for this extraction. b) Using 1.5 time the minimum rate, graphically determine the number of theoretical steps needed in the process. c) Calculate theoretical step using analytical equation d) For a packed tower with this sytem, the height of the transfer unit HoL has been estimated as 0.9m. calculate the number of transfer units NoL and the tower height in this process.

200. mL of a 6.0M solution of NaCl (solution A) is diluted to 2.00 Liters (solution B). Then 150. mL of solution B is diluted to 0.50 Liters. (solution C) What is the concentration of NaCl in solution C. Concentration in molarity=