This is worth 6 points of extra credit added to your test grade. must answer all

Question

This is worth 6 points of extra credit added to your test grade. must answer all of the questions and show all of your work clearly. You may n look up acid or base ionization constants in your question(s). To receive credit, you textbook to answer the following 1) Consider a buffer solution that is prepared by mixing 100.0 mL of 0.500 M NH3 with 100.0 mL of 0.400 M NH4CI. Record all answers to at l and watch out for rounding errors. east 3 sig figs la) Calculate the pH of this buffer. 1000ML I LNH3 Contir :Ew 1.auo" = 5.oXIO-4 Ka= lb) Calculate the pH of this buffer after 200 mg of NaOH is added to the original buffer solution in la. 5XI0 3 mol NaoH added 1000 0.0

Explanation / Answer

yes , you did part 1c correctly .

moles of NH3 = 0.05

moles of NH4Cl = 0.04

moles of HCl = 0.01

pH = pKa + log [0.05 - 0.01 / 0.04 + 0.01]

    = 9.25 + log [0.05 - 0.01 / 0.04 + 0.01]

pH = 9.15

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