Question

1. a)Calculate the pH of a 0.30M formic acid solution (Ka=1.8*10^-4)Weak monoprotic acid.

b)Calculate the Ka for a 0.050M solution of HA (weak avid if the pH=4.65

c)What is the pH of the solution which results from mixing 50.0mL of 0.30M HF (aq) and 50.0mL of 0.30M NaOH (aq) at 25C? (Kb of F- =1.4*10^-11)

I am having a hard time with these so as much detail as possible would be great, thank you for your time and your help.

Answer 1

Sdution- Given hat- So.30 M Bmic acid Solution ka .8x o Concertiaion O3X2- -ogt pth o.3t log o136 13 optfon Q.13 Corect 1

6)ka fa o. 050 MSolofion f HA Weat acid P H.65 log Anstileg es Concerntvati on ofH ka xc 11 ka xo.05 Ka C O.05 Ka

moles of HF meles Mole of Nao o.30 O.05 11 o.o15 mole F t20 CE) oo15 molee o5 M Concertralion F HF +oH TattHa e15 chonge o5-) Eilitb on 5-x ) k kw o38 x1010 ka 7.210 K-HF Co CE o.138M10 Cots-

к 2 -5 M Co -l Co loyCo43x16 pott pot H-584 8.16.