Kb = 1.8*10^-5
pKb = - log (Kb)
= - log(1.8*10^-5)
= 4.745
POH = 14 - pH
= 14 - 9.96
= 4.04
use formula for buffer
pOH = pKb + log ([NH4Br]/[NH3])
4.039999999999999 = 4.7447 + log ([NH4Br]/[NH3])
log ([NH4Br]/[NH3]) = -0.7047
[NH4Br]/[NH3] = 0.1974
[NH4Br]/0.267 = 0.1974
[NH4Br] = 0.0527
volume , V = 1.5 L
use:
number of mol,
n = Molarity * Volume
= 5.27*10^-2*1.5
= 7.905*10^-2 mol
Molar mass of NH4Br,
MM = 1*MM(N) + 4*MM(H) + 1*MM(Br)
= 1*14.01 + 4*1.008 + 1*79.9
= 97.942 g/mol
use:
mass of NH4Br,
m = number of mol * molar mass
= 7.905*10^-2 mol * 97.94 g/mol
= 7.742 g
Answer: 7.74 g
How many grams of solid ammonium bromide should be added to 1.50 L of a 0.267...
How many grams of solid ammonium bromide should be added to 1.50 L of a 0.113 M ammonia solution to prepare a buffer with a pH of 10.180 grams ammonium bromide How many grams of solid ammonium bromide should be added to 0.500 L of a 0.262 M ammonia solution to prepare a buffer with a pH of 8.420 ? grams ammonium bromide- 8
How many grams of solid ammonium bromide should be added to 1.50 L of a 0.234 M ammonia solution to prepare a buffer with a pH of 10.020 ? grams ammonium bromide = g.
How many grams of solid ammonium bromide should be added to 0.500 L of a 0.243 M ammonia solution to prepare a buffer with a pH of 9.820 ? grams ammonium bromide = ——————————————————— How many grams of solid potassium hypochlorite should be added to 1.50 L of a 0.142 M hypochlorous acid solution to prepare a buffer with a pH of 8.433 ? grams potassium hypochlorite =
How many grams of solid ammonium bromide should be added to 1.50 L of a 5.99×10-2 M ammonia solution to prepare a buffer with a pH of 10.000 ? grams ammonium bromide = __g.
How many grams of solid ammonium bromide should be added to 2.00 L of a 0.221 M ammonia solution to prepare a buffer with a pH of 8.660 ? grams ammonium bromide =
How many grams of solid ammonium bromide should be added to 0.500 L of a 0.238 M ammonia solution to prepare a buffer with a pH of 8.300? grams ammonium bromide g.
How many grams of solid ammonium bromide should be added to 1.00 L of a 0.101 M ammonia solution to prepare a buffer with a pH of 8.690 ? grams ammonium bromide = g.
How many grams of solid ammonium bromide should be added to 2.00 L of a 0.167 M ammonia solution to prepare a buffer with a pH of 8.580 ? grams ammonium bromide = g.
How many grams of solid ammonium bromide should be added to 0.500 L of a 0.253 M ammonia solution to prepare a buffer with a pH of 8.680 2 grams ammonium bromide 8
How many grams of solid ammonium chloride should be added to 1.50 L of a 0.177 M ammonia solution to prepare a buffer with a pH of 10.170? grams ammonium chloride = g.