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March 26, 2017

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How many grams of dry NH4Cl need to be added to 1.80L of 0.200M solution of ammonia,NH3, to prepare a buffer that has a pH of 8.69? Kb for ammonia is 1.8*10^-5

  • Chem - ,

    Use the Henderson-Hasselbalch equation.
    pH = pKa + log[(base)/(acid)]
    You know pKa for NH3 (you have Kb listed but pKa = 14-pKb), you know pH, and you know (base). Calculate (acid), which is the NH4Cl, and go from concn to moles to grams. Post your work if get stuck.

  • Chem - ,

    thankyou it helped

  • Chem - ,

    im a ninja

  • Chem - ,

    Can u do the steps please with the numbers

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