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.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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