Chem

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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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