An ammonium buffer solution is prepared by combining 50. mL of 0.20 M ammonia, NH3(aq), and 50. mL of 0.20 M of ammonium chloride, NH4Cl(aq). A 5.0 mL sample of 0.10 M HCl(aq) is added to the buffer solution. Which of the following is a correct pairing of the ammonium species present in greater concentration and of the pH of the solution after the HCl(aq) is added? (The pKb of ammonia is 4.7.)

(A) NH3 < 9.3
(B) NH3 > 9.3
(C) NH4+ < 9.3
(D) NH4+ > 9.3

Strong conductivity of plasma allows it to act and react as and

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 does blood clotting prevent the entry of pathogens through cuts and wounds? answer asap,, this is due tomorrow. will mark as brainliest or whatever you call it : )