Bronsted-Lowry Acids and Bases: Predicting the qualitative acid-base properties
ID: 881537 • Letter: B
Question
Bronsted-Lowry Acids and Bases: Predicting the qualitative acid-base properties of salts
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**I only need the ranking of the pH**
Consider the following data on some weak acids and weak bases acid base name formula name formula | HNO 214.5 × 10 C5H5N | 1.7×10 -4 pyridineCH.N lmethylamine | CH3NH2 4.4 × 10-4 nitrous acid HNO id hydrofluoric acidHF |6.8 × 10-4 | Use this data to rank the following solutions in order of increasing pH. In other words, select a'l'next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on solution pH 0.1 M CH3NH3Cl choose one 0.1 MC5H5NHBr choose one 0.1 M KNO2 choose one 0.1 M NaF choose one Start Over Undo HelpExplanation / Answer
answer : pH order
C5H5NHBr < CH3NH3Cl < NaF < KNO2
1 2 3 4
explanation :
1) 0.1 M CH3NH3Cl . it is the salt of weak base strong acid .
so pH <7
pH = 7 - 1/2 [pKb + logC]
= 7 - 1/2 [3.356 + log 0.1]
pH = 5.82
2) C5H5NHBr it is also weak base strong acid salt .
pH = 7 - 1/2 [pKb + logC]
= 7 - 1/2 [8.77+ log 0.1]
pH = 3.12
3)
KNO2 is salt of strong base and weak acid
pH = 7 + 1/2 [pKa + logC]
= 7 + 1/2 [3.346 + log 0.1]
pH = 8.17
4)
NaF salt of strong base and weak acid
pH = 7 + 1/2 [pKa + logC]
= 7 + 1/2 [3.167 + log 0.1]
pH = 8.08
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