Why is it critical for the ph to be 2 or below. In a lab discussing the effect of pH on food preservative HCl was added to sodium benzoate until the pH was 2 or below. It was Vacuum filtered and melted.

Determine the following for a humid air stream at 1 atm if the enthalpy deviation is - 0.6 kJ/kg dry air and the wet bulb temperature is 30 °C. Use the attached psychrometric chart. a. What is the dry bulb temperature? b. What is the humid volume? c. What is the dew point temperature? d. What is the absolute humidity? e. What is the relative humidity? f. What is the enthalpy for a saturated air stream? g. What is the actual enthalpy? h. How much water is in 40 kg (total) of this stream?

6) Flash Distillation Model ... Suppose we decide to distill the same 1000 moles of the 82 mole% cyclohexane and 18 mole% toluene mixture (see the Batch distillation problem) over a ten hour period (one day) using a flash distillation. In this case we would have a feed stream of 88.3 moles/hr and a bottoms flow rate of 11 moles/hr in order to achieve the same overall material result. A cyclohexane-toluene xy-equilibrium figure is provided for your use if needed. 0 a) For the flash option, determine the distillate and bottoms compositions. b) What would you recommend - batch or flash? Why? F=√+L zF=Y₂V*XBL F= = 1000 moles x=0.82 d=0.883 Xb= 0.117 BUF 0.020 SE301 2ACT 32581 2.12 S884

Magnesium metal, a gray solid, is heated in a crucible in the presence of oxygen. A white powder is collected from the crucible. This is an example of A) a chemical change B) a separation C) a mixture D) a physical change