I am solving the first two problems, post multiple question to get the remaining

Question

I am solving the first two problems, post multiple question to get the remaining answers

Q24)

Correct answer is Option B (HY is stronger acid than HX)

Reason:

Dissociation Equations will be

AgX ------> Ag+ + X-

AgY ------> Ag+ + Y-

Now the acid will be stronger if it is dissociating more and forming more of H+ to increase the acidic strength

If the H+ combines with X- or Y- it will shift equilibrium towards the ions side and that will lead to increase in solubility of silver salts

So if AgX is more soluble that implies HX is getting formed more in the reaction, which means the reverse reaction is getting favored more in the case of HX

Hence HY will dissociate more making it stronger acid than HX

Q25)

The pH of the buffer solution is affected by two reasons

1) With the change in Ka of the acid

2) Change in the concentration of [A-]/[HA]

Since the concentration of [A-]/[HA] is same in both the cases

Hence the correct answer is Option C

pH of buffer 1 is same as pH of buffer 2

Explanation / Answer

CHEM 2102 24) The two salts AgX and Agy have very similat solubslhties in water s en that the sen AgX is much more solubile in actd than is Agy Whst can be sad shon the etive arenh of the acids HX and HY a) H× is a stronger acid than HV b) HY is a stronger acid than H c) The acids have equal strengths d) Acid strength is ot related to solubsiläty e) Not enough information has been given to determine relative arid strengt 25) Consider two buffered solutions Boner 1 corsisti ca s o HOA. and S O M NaO~, ler , is made of 0.050 M HOAc and 0.050 M NaOhe How do the pts of the butered solutin compare a) The pH of buffer 1 is greater than that of bter b) The ph of buffer 2 is greater than that of btter c) The pt of buffer 1 is equal to that of bufter 2 d) The pHs cannot be determined without the A, vatues e) None of the answers (a d) is corect 26) Ethanethiol has a normal boling point of 35 "C and an enthaley of vaporation tt.o 27.5 kJ/mot Caculate the entropy of vaporization (A)of ethanethicn a) 89.3 K' mol b) 27.5JK mol c) 786JK mol d) -8.93 x 10 ,K'rnol , e) 945JK' mol 27) Consider the freezing of liquid water at 10 'C For this process what are the signs for AM, , and AG? An ns Option A Option B Option C Option D Option E a) Option A b) Option i c) Option d) Option D e) Option E Page 9

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