4. A student carefully weighs out exactly 2.000 grams of salicylic acid for the synthesis of
aspirin experiment but spills about half the acetic anhydride. He decides to go ahead with the
experiment as his laboratory Instructor explained acetic anhydride was "in excess”. How
might this affect his results? Would his theoretical yield calculation still be accurate? Explain.

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Which change to the system wood cause the freely-moving piston to lower?