A student prepared a standard stock copper(II) sulfate solution with an absorbance value of 0.862. The student then decided to prepare a second solution containing copper(II) sulfate from the standard stock solution. What combination of volumetric pipette and volumetric flask should the student use in order to prepare a second solution from the stock standard that will also fall within the Beer’s law absorbance limit that we discussed in class

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices