#25 and #26. I need to know the formulas used in both problems! 5. Morphine (Mrp

Question

#25 and #26. I need to know the formulas used in both problems!

5. Morphine (Mrph). a weak buse, is very effective at elieving intense pain Caleudate the pt ot a weak buse, is very effective at relieving intense pain. Calculate the phtf a 0.010 M solution of morphine. K, -8.0 × 10 7 A. 7.80 B. 8.10 C. 10.25 D. 4.05 E. 995 26. At 500.0 K, 1.0 mole of gaseous ONCI is placed in a 1.0-liter container. At equilibrium, it is 72% dissociated according to the equation: 2 ONCI(g) 2 NO(g) + Cl2(g) Determine the value of Ke: C. 1.1×102 D. 2.2 x 10 A. 4.4 x 104 E. 9.1 x 10-1 B. 2.2 x 102 l Calculate the pH and [C,H,0,'] in a 0.10 M vi

Explanation / Answer

25)
Mrph dissociates as:

Mrph +H2O     ----->     HMrph+   +   OH-
1*10^-2                   0         0
1*10^-2-x                 x         x


Kb = [HMrph+][OH-]/[Mrph]
Kb = x*x/(c-x)
Assuming x can be ignored as compared to c
So, above expression becomes

Kb = x*x/(c)
so, x = sqrt (Kb*c)
x = sqrt ((8*10^-7)*1*10^-2) = 8.944*10^-5

since c is much greater than x, our assumption is correct
so, x = 8.944*10^-5 M



So, [OH-] = x = 8.944*10^-5 M


use:
pOH = -log [OH-]
= -log (8.944*10^-5)
= 4.0485


use:
PH = 14 - pOH
= 14 - 4.0485
= 9.95
Answer: 9.95

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