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A chemistry graduate student is given 450.mL of a 1.20M ammonia NH3 solution. Ammonia is a...

A chemistry graduate student is given 450.mL of a 1.20M ammonia NH3 solution. Ammonia is a weak base with Kb=1.8x10^−5.

What mass of NH4Cl should the student dissolve in the NH3 solution to turn it into a buffer with pH =9.40?

You may assume that the volume of the solution doesn't change when the NH4Cl is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

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