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 -4 ammoniaNH1.8x 10 name formula nitrous acid | HN02 | 4.5x 10 hypochlorous a HCIO 3.0x 10 10 aniline CHsNH2 4.3 x 10 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. solution PH 0.1 M KNO2 0.1 M NH4B 0.1 M NaNOs 0.1 M CoHSNHjC choose ond choose one choose one

Explanation / Answer

Lowest pH will be for acidic compounds or salts from strong acid and weak base

strongest acid is 0.1 M C6H5NH3Cl , , hence its 1 ( its Ka = Kw/Kb = 10^ -14 / ( 4.3x10^ -10) = 0.000023

Next acidic is 0.1 NH4Br , hence its 2 ( its formed by strong acid HBr and weak base NH3 , its Ka is less than

that of C6H5NH3Cl, hence relatively less acidic than C6H5NH3+)

Next is 0.1 NaNO3 its 3 ( its neutral salt fromed by strong base and strong acid NaOH , HNO3)

Hence 0.1 M KNO2 is 4 ( KNO2 is basic formed from strong base KOH and weak acid HNO2)

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