A chemistry graduate student is given 500. mL of a 0.40μ ammonia (NH3) solution. Ammonia is a weak base with K₁=1.8×10¯5. What mass of NH4Cl should the student dissolve in the ní, solution to turn it into a buffer with pH = 9.68? You may assume that the volume of the solution doesn't change when the NH₂CI is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

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Chapter1: Chemical Foundations
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3. Please solve the following chemistry problem. 
A chemistry graduate student is given 500. mL of a 0.40 M ammonia (NH₃) solution. Ammonia is a weak base with \( K_b = 1.8 \times 10^{-5} \). What mass of NH₄Cl should the student dissolve in the NH₃ solution to turn it into a buffer with \( pH = 9.68 \)?

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.
Transcribed Image Text:A chemistry graduate student is given 500. mL of a 0.40 M ammonia (NH₃) solution. Ammonia is a weak base with \( K_b = 1.8 \times 10^{-5} \). What mass of NH₄Cl should the student dissolve in the NH₃ solution to turn it into a buffer with \( pH = 9.68 \)? 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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