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i Safari File Edit View History Bookmarks Window Help R 1 100% U. Wed Nov 22 11:47 AM : www.awh.aleks.com Sign out Gunned Down: The Power. Forum: Discussion Board... Jimmy Carter's White Hou... ALEKS Learn - Hannah2. Use This Data To Rank T O ACIDS, BASES AND AQUEOUS EQUILIBRIA Predicting the qualitative acid-base properties of salts Hannah Consider the following data on some weak acids and weak bases acid base name formula name formula acetic acid HCH CO 1 1.8×10 o-ethylamine C2NH264x 10 alo 10 hydrocyanic acid | HCN | 4.98 10 methylamine! CH3NH2 | 4.4× 1 0-4 Ar Use this data to rank the following solutions in order of increasing pH. In other words, select a 1 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. pH 0.1 M NaCN choose one 0.1 M C2HsNH3Br 0.1 M KCH3CO2 0.1 M CH3NH3Cl choose one choose one choose one Explanation Check

Explanation / Answer

A)

NaCN --> NA+ +CN-

CN- + H2O <-> HCN + OH- this is basic, pH = 9-10 approx

C2H5NH3BR --> C2H5NH3+

C2H5NH3+ <--> C2H5NH2 + H+ , this is acidic, pH = 4-5 approx

KCH3CO2 <--> K+ + CH3CO2-

CH3CO2- + H"O <- >HCH3CO2 + OH -, this is basic, pH = 8-9 approx

CH3NH3Cl = CH3NH3+ + Cl-

CH3NH3+ = CH3NH2 + H+, this is acidic,

since ethylamine is stronger base, then it is aweker acid then

NaCN > KCH3CO2 > C2H5NH3Br > CH3NH3Cl

highest pH --> lowest pH

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