Answer is: pH of methylamine is 12,2.
Chemical reaction: CH₃NH₂(aq)+ H₂O(l) ⇌ CH₃NH₃⁺(aq) + OH⁻<span>(aq).
Kb(</span>CH₃NH₂) = 4,4·10⁻⁴.
c₀(CH₃NH₂) =
0,57 M.
c(CH₃NH₃⁺) = c(OH⁻) =
x.
c(NH₂OH) = 0,57 M - x.
Kb
= c(CH₃NH₃⁺) · c(OH⁻) / c(CH₃NH₂).
0,00044 = x² / (0,57 M - x).
Solve
quadratic equation: x = c(OH⁻) =
0,0156 mol/L.
pOH
= -log(0,0156 mol/L.) = 1,80.
pH
= 14 - 1,80 = 12,2.
Because you are missing information i'm going to give you meters converted into every sensible unit:
1.69 meters = 169 centimeters = 1690 millimeters = 0.169 kilometers
Question: What do you need help with?
Answer:
PE ( Potential Energy ) = Mass x Gravity x Height
Explanation:
For the first one you would do.
.28 ( mass) x 9.8 ( constant of gravity ) x .40m ( height )
So just multiply your Mass, Gravity and Height together and you will get Potential Energy
Gravity is always 9.8 m/s
