rthe following data on some weak acids and weak bases: acid base formula name fo

Question

rthe following data on some weak acids and weak bases: acid base formula name formula 64 10 acetic acidHCH,CO2 1.8 10 ethylamine C,H NIH |hydrocyanic acid | HCN |4.9 ×1010| anillie C,H,NH2 43 x 10 10 Use this data to rank the following solutions in order of increasing p. In other words, select a I' nest to the solution that vwll have the lowest pHt, a 2 next to the solution that will have the next lowest pH, and so on. a I' next to the solution that will have the lowest prt, a2 next pH 0.1 M CtHNHCI 0.1 M KI 0.1 M KCN

Explanation / Answer

Higher the Ka value the stronger the acid and Higher the Kb stronger the base.

Stronger the acid lower the pH and stronger the base higher the pH.

So, the pH order is as follows:
1. C2H5NH3Br (Kb is higher than C6H5NH3Cl,)
2. C6H5NH3Cl
3. KI (pH = 7, neutal)
4. KCN (weak acid HCN)

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