Consider the following data on some weak acids and weak bases: acid base name fo

Question

Consider the following data on some weak acids and weak bases: acid base name formula name formula hydrocyanic acid HCN | 4.9 × 10 10 aniline CHsNH2 4.3 x 10 hypochlorous acid HCIO3.0x 10-8 ammonia NH 31.8 x 10-5 Use this data to rank the following solutions in order of increasing pH. In other words, select a ''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 NH4Br choose one 0.1 M KCN choose one 0.1 M CsH5NH3CI choose one 0.1 M Nacio choose one

Explanation / Answer

a)

NH4Br = NH4+ + BR-

NH4+ = NH3 + H+

this is acidic, pH

KCN --> CN- + K+

CN- + H2O<-> HCN + OH-

this is basic,

C6H5NH3Cl = C6H5NH3+ + Cl-

C6H5NH3+ = C6H5NH2 + H+ + Cl-

this is acidic

then

most acidic - least acidic

aniline compound > Ammonia compound

most basic - least basic

ClO- HCN

then

number goes as

pH trend

C6H6NH3Cl < NH4Br < KCN < NaClO

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