s previous | 2 of 15 | next ± Buffers in Medicine The Henderson-Hasselbalch equa
ID: 1054731 • Letter: S
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s previous | 2 of 15 | next ± Buffers in Medicine The Henderson-Hasselbalch equation relates the where HCOs is given in millimoles/liter and the arterial blood partial pressure of CO2 is given in mmHg. The pK, of carbonic acid is 6.1. Hyperventlation causes a physiological state in which the concentration of CO2 in the bloodstream drops. The drop in the partial pressure of COa constricts arteries and reduces blood flow to the brain, causing dizziness or even fainting pH of a buffer solution to the pK, of its conjugate acid and the ratio of the concentrations of the conjugate base and acid. The equation is important n laboratory work that makes use of buffered solutions, in industrial processes where pH needs to be controlled, and in medicine, where understanding the Henderson-Hasselbalch equation is onitical for the control of blood pH. Part B If the normal physiological concentration of HCO, is24 mM, what is the pl of blood if Pco, drops to 25.0 mmHg? Express your answer numerically using two decimal places Hints My Answers Give Up Revilew Part Submit Incorrect: Try Again; 4 attempts remainingExplanation / Answer
B) Calculation of mass of NH4Cl:
Given that pH = 8.57
pOH = 14 - pH = 14 - 8.57 = 5.43
Kb = 1.8 x 10-5
[NH3] = Moles of NH3 = molarity x volume in litres = 0.1 M x 1.8 L = 0.18 mol
[NH4Cl] = ?
pOH = pKb + log [NH4Cl]/[NH3]
pOH = -logKb + log [NH4Cl]/[NH3]
5.43 = - log (1.8 x 10-5) + log { [NH4Cl]/ [0.18 ]
5.43 = 5 - log 1.8 + log { [NH4Cl]/ [0.18 ]
log { [NH4Cl]/ [0.18 ] = 5.43 - 5 + log 1.8
[NH4Cl] = 0.18 x 10^(5.43 - 5 + log 1.8 )
= 0.87 mol
Mass of NH4Cl = moles x molar mass
= 0.87 mol x 53.5 g/mol
= 46.5 g
A ) MgCO3 (or) PbBr2:
Ans = MgCO3
If the anion of a salt is the conjugate base of a weak acid, then the salt is more soluble in acid.
If the anion of a salt is the conjugate base of a strong acid, , then the salt is not more soluble in acid.
MgCO3:
Anion of MgCO3 = CO32- It is a conjugate base of weak acid H2CO3.
Therefore, MgCO3 is more soluble in acid.
PbBr2:
Anion of PbBr2 = Br- It is a conjugate base of strong acid HBr.
Therefore, PbBr2 is not more soluble in acid.
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