Una solución de nh3+ nh4cl tiene una una concentración total 0,1 m. calcular las concentraciones molares de ambas especies si el ph de la solución es de 8,95. recuerde que el ph + poh = 14

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.

Calculate the mass of 0.750 mol of the following substance. na3po4. , i'm not quite sure on how to set up the problem to solve! : (

Pls why does copper oxide appear on a penny faster when a penny is heated in a flame than when the penny is at room temperature explain