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Chem Help PLEASE!

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Asked earlier but got no reply :/ hopefully I get one now cause I'm really stuck and can't completely my assignment cause of one question..

How many grams of dry NH4Cl need to be added to 1.90 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.99? Kb for ammonia is1.8*10^-5.

Can anyone help me with this question? Thanks in advance!

  • Chem Help PLEASE! -

    nvm got it.

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