2) the isotope90_sr has a half-life of 28.8 years. what is the activity, measured in atoms/second of a 50 mg sample of sr? (10 pts.)

What type of solution is formed if 10 g of kclo3 are dissolved in 100g of water at 30

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

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.