Question

20 Classify the following chemical reaction: 2 Ag (s)+Cl2 (g) ->2 AgCl (s) Choose all that apply a) combustion reaction b) single-replacement reaction c) double-replacement reaction d) nonredox reaction e) redox reaction f) synthesis reaction 28 f the dissociation constant of a weak acid is 1.8 x 10, at what ratio should you adjust the concentration of the weak acid and its conjugate base in order to prepare a buffer that has a pH of 3.747 a) 0.300 M weak acid with 0.600 M conjugate base b) 0.300 M weak acid with 0.300 M conjugate base c)o600 M weak acid with 0.300 M conjugate base d) 0.300 M weak acid with 0.0300 M conjugate base Oe)0.0300M weak acid with 0.300 M conjugate base The Kg of hydrofluoric acid (HF) is 6.8 x 10 What is the pH of a buffer solution that is prepared from 0.0400 M HF and 0.0200 M sodium fluoride (NaF)? 29 O a) 1.9 Ob) 2.9 c) 3.2 Od) 2.0 PIC COLLAGE

Answer 1

a) 2.Ag) + () combination of his single comprend so of synthesis reaction Ang syntheid reaction 249 dpcs) compounds gice a it is a combination Reactive kag wale aeid 1.3x104 pka - 60 (118x10) = 4-0.25527= 3.7447 pH 3.74 pHopka los [ crijugute bal} [week wid] 3.74 3.74 + los (conjugale bare) chead aird] las (crizugute bove] [weakneid] = (crojugate bare ] 2 = 10 = 1 (weakaid] =) [ conjugate bove] = (weak aeid] so redariling conjugude bave - redanity & weak acid .

will 0.300M conjusale love AR 6 0.3004 wakaeid kag HF - 6.8x104 ka - – los (6.8x10) - 4 - 0.83250 = 3.1674 CHE] =0.0400M Cour]: 0.02004 Appen under say gelin pH = pka + 60g Croat] CHAT • 31674 +105 (0.02004) To 0400 M) = 3- 1674 + 0) (0.5) + 3.1674 + (-0.301029) = 2.86 PL - 2.9 ay 6 29 /