Anew potential heart medicine, code-named x-281, is being testedby a pharmaceutical company, pharma-pill. as a research technicianat pharma-pill, you are told that x-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula mustremain top secret. the company is interested in the drug'sk_a value because only the dissociated form of the chemicalis active in preventing cholesterol buildup in arteries. to find the pka of x-281, you prepare a 0.084 \it m test solution of x-281. the ph of the solution isdetermined to be 2.40. what is the pka of x-281?

Oxidation state of iron in mohrs salt

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.

Element before carbon on the periodic table