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A 130.0 mL buffer solution is 0.110 M in NH3 and 0.135 M in NH4Br. (Kb...

A 130.0 mL buffer solution is 0.110 M in NH3 and 0.135 M in NH4Br. (Kb of NH3 is 1.76×10−5.)

a.)What mass of HCl can this buffer neutralize before the pH falls below 9.00?

I already did this and got 0.101 g, which is right, but I am struggling to answer Part B.

b.)If the same volume of the buffer were 0.255 M in NH3 and 0.400 M in NH4Br, what mass of HCl could be handled before the pH falls below 9.00?

The answer is not: 0.0915 or 0.0916

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queen_honey_blossom answered 2 years ago
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