A 110.0 mL buffer solution is 0.100 M in NH3 and 0.125 M in NH4Br. (Kb of NH3 is 1.76×10−5.)
question: If the same volume of the buffer were 0.250 M in NH3 and 0.395 M in NH4Br, what mass of HCl could be handled before the pH falls below 9.00?
Help ASAP Please!!!!!
Answer:
Starting number of moles of NH?
= ([NH?])(volume of cushion arrangement in L)
= (0.250)(110x10-³)
= 0.0275
Starting number of moles of NH??
= ([NH??])(volume of cushion arrangement in L)
= (0.395)(110x10?³)
= 0.04345
Kb of NH3 is 1.76×10-5
pKb=-log(1.76×10-5)=4.754487
pOH= pKb+lg([NH??]/[NH?])
= 4.754487+log(0.395/0.250)
= 4.953
pH= 14-4.953
= 9.046856
Be that as it may, the pH is 9.00, So pOH=5
pOH-pKb=log([NH??]/[NH?])
5.00-4.754487= lg([NH??]/[NH?])
[NH??]/[NH?]= 10^(5.00-4.754487)
= 1.76
Number of moles of NH??/number of moles of NH?= 1.76
At the point when HCl is included, the accompanying response happens:
NH?(aq)+HCl(aq)?NH?Cl(aq)
As per the condition, the proportion of the quantity of moles of NH? that responds to that of HCl that responds is 1:1. Give x a chance to be the quantity of moles of HCl included
NH?(aq)+HCl(aq)?NH?Cl(aq)
starting: 0.0275 0.04345
change: - x +x
balance: 0.0275-x 0.04345+x
Presently, (0.04345+x)/(0.0275-x)= 1.76
2.76x= -0.3861
x= -0.13989
1 mole of HCl= 36.5g
-0.13989 moles of HCl
= (36.5)(-0.13989)
= -5.105985 g
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