A chemistry graduate student is given 300. mL of a 0.20 M ammonia (NH_3) solution. Ammonia is a weak base with K_b = 1.8 times 10^-5. What mass of NH_4 Br should the student dissolve in the NH3 solution to turn it into a buffer with pH = 9.10? You may assume that the volume of the solution doesn't change when the NH4Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

output?

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

explanation: no but i do not usually comment

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.