#3 ?Bronsted-Lowry Acids and Bases: Predicting the qualitative acid-base propert
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#3
?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**
I have a few of these so please look for them and answer asap :)
Consider the following data on some weak acids and weak bases acid base name formula name formula C6H5NH2 | 4.3 × 10 10 hydrofluoric acidHF 6.8×10-4 anilineCHNH -10 hydroxylamine ! HONH2 11.1×10 hydrocyanic acid HCN A49X 1O 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 MC6H5NH3Cl 0.1 MHONH3Br 0.1 M NaF 0.1 M Nal choose one choose one choose one choose one Start Over Undo HelpExplanation / Answer
answer : pH order
C6H5NH3Cl < OHNH3Br < NaI < NaF
1 2 3 4
explanation :
1) 0.1 M C6H5NH3Cl . it is the salt of weak base strong acid .
so pH <7
pH = 7 - 1/2 [pKb + logC]
= 7 - 1/2 [9.36 + log 0.1]
pH = 2.82
2) HONH3Br it is also weak base strong acid salt .
pH = 7 - 1/2 [pKb + logC]
= 7 - 1/2 [7.96+ log 0.1]
pH = 3.52
3)
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
4)
NaI is salt of strong base and strong acid
pH = 7
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