Abuffer solution is composed of 1.00 mol of acid and 2.25 mol of the conjugate base. if the p k a of the acid is 4.90 , what is the ph of the buffer?

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

If an area has high air pressure and low humidity, what type of weather will it most likely have? 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.