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& Oto) We use Henderson - Hasselbalch equation as legio ((NH4Br] + [H43) pOH = pkb + since ((NH3 ] - [HU]) POH 25 so that pH falls beloco 9.00 logoo ( EN My Bo ] + [HUI) 75 ((NH₃] - [HU]) РКь t = ) 4.75 + • logio (0.390 + 0.2285%) 25 (0.265 -0.2285-2) logio 0.25 (0.390 + 0.2285 x ) ? (0.265 - 0.2285 x) 0.390 + 0.2285 x > 0.25 10 = 1.78 0.265 - 0.2285 x 0.390+ 0.2285 x 7 0.4717-0.40673x 0.63523 x > 0.0817 x ? 0.1294 Thue, mass of Hel that could be added so that pH falls below 9.00 is 0.129g

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