Calculate the concentrations of carbonic acid (pa=6.4) and carbonate in a 0.20 M buffer solution at pH 6.9. Avoid rounding until the end of the calculations. Enter your answer to two significant figures.

How many moles are equivalent to 55.5g of nano3

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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.