Answer:
5.86
Explanation:
The equation of reaction is between methylamine and hydrochloric acid
CH₃NH₂ + HCl -------> CH₃NH⁺₃ + Cl⁻
At equivalence point, there is a mixture of equal volume of acid and base. As such, the concentration of CH₃NH⁺₃ will be half the initial starting concentration of the reactant.
i.e [CH₃NH⁺₃] =
= 0.095 M
Now, the dissociation of CH₃NH⁺₃ yields
CH₃NH⁺₃ ⇄ CH₃NH₂ + H⁺
The ICE Table can be constructed as follows:
CH₃NH⁺₃ ⇄ CH₃NH₂ + H⁺
Initial 0.095 0 0
Change -x x x
Equilibrium (0.095 - x) x x
------ equation (1)
We all know that:
and we are given = ; and ;
Then;
We can now re-write the equation (1) to be :
where a = 1; b = 2×10⁻¹¹; c = 1.9×10⁻¹²
Using the quadratic formula; ; we have
= OR
x =
[CH₃NH₂] = [H⁺] =
∴ pH = -log [H⁺]
pH = -log
pH = 5.86
Hence, the pH at the equivalence point for the titration = 5.86
A — H2O is one chemically bound molecule, and if you only have one molecule present then it can’t be a mixture, as what is it mixed with??
Molar concentration (c) = # of moles of solute (n) ÷ volume of solvent (v) in liters
So the molar mass of Nickel Chloride Hexahydrate is 237.69 g/mol.
So the # moles of 2 gms is:
Answer: Buffered aspirin is a combination of aspirin and antacid. It's mainly used to reduce heartburn and upset stomach that an ORIGINAL aspirin might cause.
Explanation: I did my research, and it's more than correct!
Answer: The amount left after 4.94 days is
Explanation:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
b) to calculate amount left after 4.94 days
The amount left after 4.94 days is