Homework Help: Chem

Posted by Jennifer on Saturday, April 18, 2009 at 6:19pm.

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 - DrBob222, Saturday, April 18, 2009 at 6:38pm
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 - Jennifer, Saturday, April 18, 2009 at 7:32pm
thankyou it helped
Chem - Anonymous, Saturday, January 21, 2012 at 8:04am
im a ninja
Chem - Pookali, Saturday, January 21, 2012 at 8:05am
Can u do the steps please with the numbers
Chem - JenniferBasterD!@#$%^&er, Saturday, January 21, 2012 at 8:06am
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Chem - Jenniferlikes to sucky the!@#$%^&y, Saturday, January 21, 2012 at 8:06am
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Chem - Jenniferlikes to sucky the!@#$%^&y, Saturday, January 21, 2012 at 8:07am
monagaagagagagaga

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