Which beses is weaker than ammonia?

Base

Ammonia

Hydroxylamine

Methylamine

Pyridine

Ko (at 25°C)

1.8 105

1.1 x 10-

4.4 x 10-

1.7 x 10

Can someone me with questions 12 and 13 plz.

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

How is the atomic number of a nucleus changed by alpha decay