Nelly Predicting the qualitative acid-base properties of salts base name formula

Question

Nelly Predicting the qualitative acid-base properties of salts base name formula name formula nitrous acid HNO2 4.5 x 10 pyridine CSHN 1.7 x10 hydrofuoric acidF 6.8 x10 hydroxylamine HONH 1.1108 olo Use this data to rank the following solutions in order of increasing pH. In other words, s the solution that will have the next lowest pH, and so on. elect a '1 next to the solution that will have the lowest pH, a 2' next to Ar pH 0.1 5HsNHO 0.1 M HONH2Br 0.1 M KNO2 0.1 M Nal 1 (lowest) 4 (highest) 9:29 PM O Type here to search R/23/2018

Explanation / Answer

pH of 0.1 M C5H5NHCl

C5H5NHCl = Weakbase,strong acid salt

pH = 7-1/2(pkb+logC)

pkb of C5H5 = -log(1.7*10^-9) = 8.77

C = concentration of salt = 0.1 M

pH = 7-1/2(8.77+log0.1)

   = 3.115

pH of HONH3Br

HONH3Br = Weakbase,strong acid salt

H = 7-1/2(pkb+logC)

pkb of HONH2 = -log(1.1*10^-8) = 7.96

C = concentration of salt = 0.1 M

pH = 7-1/2(7.96+log0.1)

   = 3.52

pH of KNO2

KNO2 = Weakacid,strong base salt

pH = 7+1/2(pka+logC)

pka of HNo2 = -log(4.5*10^-4) = 3.35

C = concentration of salt = 0.1 M

pH = 7+1/2(3.35+log0.1)

   = 8.175

pH of 0.1 M NaI

NaI = strong acid,strong base salt. (neutral)

pH = 7

Answer:

1. lowest = C5H5NHCl

2. HONH3Br

3. NaI

4. KNO2

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