pKa for methyl salicylate is 9.81. Your dirty products have a very low pH, becau
ID: 534127 • Letter: P
Question
pKa for methyl salicylate is 9.81. Your dirty products have a very low pH, because of the acid. What pH would you expect for a nicely purified product that contains 5.00 gin 0, 100 L of H_2O? The molecular weight of methyl salicylate is 152.15 g/mol. Lead (II) sulfide, PbS(s) is one of the "safest" lead compounds because it is insoluble. However, it can oxidize under certain conditions and become PbO(s), which is very unsafe. Consider the oxidation reaction, _____ PbS(s) + _____ O_2(g) rightarrow _____ PbO(s) + _____ SO_2(g) a) Fill in the blanks to balance the reaction. b) For the entire, balanced reaction Delta H degree = -84.4 kJ, Delta S degree = -165 J/K. At what temperature will lead sulfide around your house spontaneously oxidize and make poisonous lead oxide assuming otherwise standard conditions?Explanation / Answer
3)
molarity of methylsalicylate = ( mass / molar mass ) x 1/ volume
= ( 5 / 152 .15) x 1 / 0.1
= 0.329 M
pH = 1/2 [pKa -logC]
pH = 1/2 [9.81 - log 0.329]
pH = 5.15
4)
2 PbS + 3 O2 ------------------------> 2 PbO + 2 SO2
T = DH / DS
T = -84.4 / -165 x 10^-3
T = 511.5 K
at 512 K the resaction is spontaneous
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.