The indicator dinitrophenol is an acid with a K of 1.1x10-4. In a 1.0x10-4-M solution, it is colorless in acid and yellow in base. Calculate the maximum pH value over which it goes from
10% ionized (colorless) to 90% ionized (yellow), given the minimum pH value is 3.00.

One of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)