Question

Consider the following data on some weak acids and weak bases: acid Ky name formula nitrous acid HNO2 4.5 x 10-4 base name formula pyridine CzH;N 1.7x10-9 ammonia NHz 1.8 10-5 hypochlorous acid HClO 3.0 x 10-8 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 KI choose one 0.1 M NH4Br choose one v 0.1 M C5H5NHCI choose one v 0.1 M Nacio choose one X 5 ?

Answer 1

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formula used pka = -logkapky - logo t o (pka) s-log 3.0x10 = 7.52 HCIO - - - - b) CSHSN = -log 1-7x169 = 8.77 (pkb Ne s-logi-8x105 = 4.74 Lp → Oolm kI salt of strong acid strong base PH=t - 0.im Nhy By salt of strong acid weak bose HER phasslpkw -pky-1999) = {(14=4.74– 10g 0-1) = 5-13 → 0. IM CH, NHCl. Salt a strong acid weakbase pH = 2 (pku-pky-log C) = 1/2 (14-8-77-logo-1) = 3-12 Oolm Nacho salt of weak acid strong base pH = y ₂ pk w+ pkatlog() = 2 ( 14+7.52 tlogo-1) = 10.26 - PH O: Tмках -3 о: 1м Nң4By Oolm Cts Naci 0-im nacio 7.0 5 -13 3-12 10. 26 as Scanneld with CamScanner