A 1.20g +/- 0.01g sample of hydrated MgCO3 is heated to drive of the water. The dry sample has a mass of 0.58g +/- 0.01g.

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

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.

To separate a mixture of hard candies nd marbles the most efficient method would be